64251999987 has 32 divisors (see below), whose sum is σ = 104303181312. Its totient is φ = 34343668224.

The previous prime is 64251999983. The next prime is 64251999989. The reversal of 64251999987 is 78999915246.

It is not a de Polignac number, because 64251999987 - 2² = 64251999983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64251999983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 493888 + ... + 610269.

It is an arithmetic number, because the mean of its divisors is an integer number (3259474416).

Almost surely, 2^64251999987 is an apocalyptic number.

64251999987 is a deficient number, since it is larger than the sum of its proper divisors (40051181325).

64251999987 is a wasteful number, since it uses less digits than its factorization.

64251999987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104347.

The product of its digits is 88179840, while the sum is 69.

The spelling of 64251999987 in words is "sixty-four billion, two hundred fifty-one million, nine hundred ninety-nine thousand, nine hundred eighty-seven".