65505570621645 has 96 divisors (see below), whose sum is σ = 131665690646784. Its totient is φ = 27222079610880.

The previous prime is 65505570621643. The next prime is 65505570621809. The reversal of 65505570621645 is 54612607550556.

It is not a de Polignac number, because 65505570621645 - 2¹ = 65505570621643 is a prime.

It is a super-3 number, since 3×65505570621645³ (a number of 42 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65505570621643) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 409491117 + ... + 409651053.

It is an arithmetic number, because the mean of its divisors is an integer number (1371517610904).

Almost surely, 2^{65505570621645} is an apocalyptic number.

It is an amenable number.

65505570621645 is an abundant number, since it is smaller than the sum of its proper divisors (66160120025139).

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

65505570621645 is a wasteful number, since it uses less digits than its factorization.

65505570621645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192211 (or 192200 counting only the distinct ones).

The product of its (nonzero) digits is 37800000, while the sum is 57.

The spelling of 65505570621645 in words is "sixty-five trillion, five hundred five billion, five hundred seventy million, six hundred twenty-one thousand, six hundred forty-five".