64651731603780 has 24 divisors (see below), whose sum is σ = 181024848490752. Its totient is φ = 17240461760992.

The previous prime is 64651731603773. The next prime is 64651731603827. The reversal of 64651731603780 is 8730613715646.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 64651731603780.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538764429972 + ... + 538764430091.

It is an arithmetic number, because the mean of its divisors is an integer number (7542702020448).

Almost surely, 2^{64651731603780} is an apocalyptic number.

64651731603780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64651731603780 is an abundant number, since it is smaller than the sum of its proper divisors (116373116886972).

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

64651731603780 is a wasteful number, since it uses less digits than its factorization.

64651731603780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077528860075 (or 1077528860073 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 57.

The spelling of 64651731603780 in words is "sixty-four trillion, six hundred fifty-one billion, seven hundred thirty-one million, six hundred three thousand, seven hundred eighty".