64537071813861 has 8 divisors (see below), whose sum is σ = 86049655664544. Its totient is φ = 43024601252880.

The previous prime is 64537071813859. The next prime is 64537071813923. The reversal of 64537071813861 is 16831817073546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64537071813861 - 2¹ = 64537071813859 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64537071813795 and 64537071813804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64537071813811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26984175 + ... + 29278316.

It is an arithmetic number, because the mean of its divisors is an integer number (10756206958068).

Almost surely, 2^{64537071813861} is an apocalyptic number.

It is an amenable number.

64537071813861 is a deficient number, since it is larger than the sum of its proper divisors (21512583850683).

64537071813861 is a wasteful number, since it uses less digits than its factorization.

64537071813861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56644851.

The product of its (nonzero) digits is 20321280, while the sum is 60.

The spelling of 64537071813861 in words is "sixty-four trillion, five hundred thirty-seven billion, seventy-one million, eight hundred thirteen thousand, eight hundred sixty-one".