64540809059672 has 32 divisors (see below), whose sum is σ = 132978906547920. Its totient is φ = 29122594659840.

The previous prime is 64540809059647. The next prime is 64540809059687. The reversal of 64540809059672 is 27695090804546.

It is a junction number, because it is equal to n+sod(n) for n = 64540809059599 and 64540809059608.

It is a congruent number.

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, 2676697013 + ... + 2676721124.

Almost surely, 2^{64540809059672} is an apocalyptic number.

It is an amenable number.

64540809059672 is an abundant number, since it is smaller than the sum of its proper divisors (68438097488248).

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

64540809059672 is a wasteful number, since it uses less digits than its factorization.

64540809059672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5353418291 (or 5353418287 counting only the distinct ones).

The product of its (nonzero) digits is 130636800, while the sum is 65.

The spelling of 64540809059672 in words is "sixty-four trillion, five hundred forty billion, eight hundred nine million, fifty-nine thousand, six hundred seventy-two".