64158561 has 56 divisors (see below), whose sum is σ = 105767424. Its totient is φ = 38724480.

The previous prime is 64158557. The next prime is 64158583. The reversal of 64158561 is 16585146.

64158561 is a `hidden beast` number, since 6 + 41 + 58 + 561 = 666.

It is not a de Polignac number, because 64158561 - 2² = 64158557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64158551) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 384100 + ... + 384266.

It is an arithmetic number, because the mean of its divisors is an integer number (1888704).

Almost surely, 2^64158561 is an apocalyptic number.

It is an amenable number.

64158561 is a deficient number, since it is larger than the sum of its proper divisors (41608863).

64158561 is a wasteful number, since it uses less digits than its factorization.

64158561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 218 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 64158561 is about 8009.9039320082. The cubic root of 64158561 is about 400.3300629878.

The spelling of 64158561 in words is "sixty-four million, one hundred fifty-eight thousand, five hundred sixty-one".