65666777520036 has 96 divisors (see below), whose sum is σ = 191045456179200. Its totient is φ = 17054981683200.

The previous prime is 65666777519977. The next prime is 65666777520053. The reversal of 65666777520036 is 63002577766656.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9177540 + ... + 14681988.

It is an arithmetic number, because the mean of its divisors is an integer number (1990056835200).

Almost surely, 2^{65666777520036} is an apocalyptic number.

65666777520036 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

65666777520036 is an abundant number, since it is smaller than the sum of its proper divisors (125378678659164).

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

65666777520036 is a wasteful number, since it uses less digits than its factorization.

65666777520036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5517385 (or 5517383 counting only the distinct ones).

The product of its (nonzero) digits is 400075200, while the sum is 66.

The spelling of 65666777520036 in words is "sixty-five trillion, six hundred sixty-six billion, seven hundred seventy-seven million, five hundred twenty thousand, thirty-six".