4012666640 has 20 divisors (see below), whose sum is σ = 9329450124. Its totient is φ = 1605066624.

The previous prime is 4012666631. The next prime is 4012666643. The reversal of 4012666640 is 466662104.

It can be written as a sum of positive squares in 2 ways, for example, as 1472103424 + 2540563216 = 38368^2 + 50404^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×4012666640² = 32202987127537779200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 4012666640.

It is not an unprimeable number, because it can be changed into a prime (4012666643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25079087 + ... + 25079246.

Almost surely, 2^4012666640 is an apocalyptic number.

4012666640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4012666640 is an abundant number, since it is smaller than the sum of its proper divisors (5316783484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4012666640 is a wasteful number, since it uses less digits than its factorization.

4012666640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50158346 (or 50158340 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 4012666640 is about 63345.6126341833. The cubic root of 4012666640 is about 1589.0748728740.

The spelling of 4012666640 in words is "four billion, twelve million, six hundred sixty-six thousand, six hundred forty".