66428807040 has 96 divisors (see below), whose sum is σ = 229386994200. Its totient is φ = 17714347008.

The previous prime is 66428806987. The next prime is 66428807101. The reversal of 66428807040 is 4070882466.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5760630 + ... + 5772149.

Almost surely, 2^66428807040 is an apocalyptic number.

66428807040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66428807040 is an abundant number, since it is smaller than the sum of its proper divisors (162958187160).

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

66428807040 is a wasteful number, since it uses less digits than its factorization.

66428807040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11532804 (or 11532789 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The spelling of 66428807040 in words is "sixty-six billion, four hundred twenty-eight million, eight hundred seven thousand, forty".