1649869660 has 24 divisors (see below), whose sum is σ = 3468104640. Its totient is φ = 659304384.

The previous prime is 1649869657. The next prime is 1649869667. The reversal of 1649869660 is 669689461.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649869667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18919 + ... + 60478.

It is an arithmetic number, because the mean of its divisors is an integer number (144504360).

Almost surely, 2^1649869660 is an apocalyptic number.

1649869660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1649869660 is an abundant number, since it is smaller than the sum of its proper divisors (1818234980).

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

1649869660 is a wasteful number, since it uses less digits than its factorization.

1649869660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80445 (or 80443 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 55.

The square root of 1649869660 is about 40618.5876170012. The cubic root of 1649869660 is about 1181.6346348373.

The spelling of 1649869660 in words is "one billion, six hundred forty-nine million, eight hundred sixty-nine thousand, six hundred sixty".