64536401515 has 8 divisors (see below), whose sum is σ = 78195562848. Its totient is φ = 51127867200.

The previous prime is 64536401507. The next prime is 64536401533. The reversal of 64536401515 is 51510463546.

It is a happy number.

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

It is not a de Polignac number, because 64536401515 - 2³ = 64536401507 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62656186 + ... + 62657215.

It is an arithmetic number, because the mean of its divisors is an integer number (9774445356).

Almost surely, 2^64536401515 is an apocalyptic number.

64536401515 is a deficient number, since it is larger than the sum of its proper divisors (13659161333).

64536401515 is a wasteful number, since it uses less digits than its factorization.

64536401515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125313509.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 64536401515 in words is "sixty-four billion, five hundred thirty-six million, four hundred one thousand, five hundred fifteen".