64391243015 has 16 divisors (see below), whose sum is σ = 84308804640. Its totient is φ = 46821765120.

The previous prime is 64391242969. The next prime is 64391243027. The reversal of 64391243015 is 51034219346.

64391243015 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64391243015 - 2²⁶ = 64324134151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64391243015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222191 + ... + 422079.

It is an arithmetic number, because the mean of its divisors is an integer number (5269300290).

Almost surely, 2^64391243015 is an apocalyptic number.

64391243015 is a deficient number, since it is larger than the sum of its proper divisors (19917561625).

64391243015 is a wasteful number, since it uses less digits than its factorization.

64391243015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205762.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 64391243015 in words is "sixty-four billion, three hundred ninety-one million, two hundred forty-three thousand, fifteen".