64311091887 has 24 divisors (see below), whose sum is σ = 99792798336. Its totient is φ = 36732623088.

The previous prime is 64311091877. The next prime is 64311091963. The reversal of 64311091887 is 78819011346.

It is not a de Polignac number, because 64311091887 - 2¹⁵ = 64311059119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64311091847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 232198 + ... + 427244.

It is an arithmetic number, because the mean of its divisors is an integer number (4158033264).

Almost surely, 2^64311091887 is an apocalyptic number.

64311091887 is a deficient number, since it is larger than the sum of its proper divisors (35481706449).

64311091887 is a wasteful number, since it uses less digits than its factorization.

64311091887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197307 (or 197300 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 64311091887 in words is "sixty-four billion, three hundred eleven million, ninety-one thousand, eight hundred eighty-seven".