64581388257 has 8 divisors (see below), whose sum is σ = 86109779584. Its totient is φ = 43053627888.

The previous prime is 64581388229. The next prime is 64581388273. The reversal of 64581388257 is 75288318546.

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

It is not a de Polignac number, because 64581388257 - 2¹⁶ = 64581322721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64581388197 and 64581388206.

It is not an unprimeable number, because it can be changed into a prime (64581388217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191643 + ... + 407295.

It is an arithmetic number, because the mean of its divisors is an integer number (10763722448).

Almost surely, 2^64581388257 is an apocalyptic number.

It is an amenable number.

64581388257 is a deficient number, since it is larger than the sum of its proper divisors (21528391327).

64581388257 is a wasteful number, since it uses less digits than its factorization.

64581388257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315479.

The product of its digits is 12902400, while the sum is 57.

The spelling of 64581388257 in words is "sixty-four billion, five hundred eighty-one million, three hundred eighty-eight thousand, two hundred fifty-seven".