66345206511645 has 96 divisors (see below), whose sum is σ = 116718205613568. Its totient is φ = 34856159376384.

The previous prime is 66345206511629. The next prime is 66345206511653. The reversal of 66345206511645 is 54611560254366.

66345206511645 is a `hidden beast` number, since 6 + 6 + 3 + 4 + 520 + 6 + 51 + 1 + 64 + 5 = 666.

It is not a de Polignac number, because 66345206511645 - 2⁴ = 66345206511629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66345206511591 and 66345206511600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15206325234 + ... + 15206329596.

It is an arithmetic number, because the mean of its divisors is an integer number (1215814641808).

Almost surely, 2^{66345206511645} is an apocalyptic number.

It is an amenable number.

66345206511645 is a deficient number, since it is larger than the sum of its proper divisors (50372999101923).

66345206511645 is a wasteful number, since it uses less digits than its factorization.

66345206511645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9123 (or 9120 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 54.

The spelling of 66345206511645 in words is "sixty-six trillion, three hundred forty-five billion, two hundred six million, five hundred eleven thousand, six hundred forty-five".