64892735522991 has 48 divisors (see below), whose sum is σ = 99197454950880. Its totient is φ = 40765089024000.

The previous prime is 64892735522971. The next prime is 64892735523037. The reversal of 64892735522991 is 19922553729846.

64892735522991 is a `hidden beast` number, since 6 + 4 + 8 + 9 + 2 + 7 + 3 + 5 + 522 + 9 + 91 = 666.

It is not a de Polignac number, because 64892735522991 - 2¹⁰ = 64892735521967 is a prime.

It is a super-2 number, since 2×64892735522991² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64892735522911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32875251 + ... + 34793211.

It is an arithmetic number, because the mean of its divisors is an integer number (2066613644810).

Almost surely, 2^{64892735522991} is an apocalyptic number.

64892735522991 is a deficient number, since it is larger than the sum of its proper divisors (34304719427889).

64892735522991 is a wasteful number, since it uses less digits than its factorization.

64892735522991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919048 (or 1919045 counting only the distinct ones).

The product of its digits is 587865600, while the sum is 72.

The spelling of 64892735522991 in words is "sixty-four trillion, eight hundred ninety-two billion, seven hundred thirty-five million, five hundred twenty-two thousand, nine hundred ninety-one".