64936529691 has 128 divisors (see below), whose sum is σ = 106323148800. Its totient is φ = 34797288960.

The previous prime is 64936529687. The next prime is 64936529747. The reversal of 64936529691 is 19692563946.

It is not a de Polignac number, because 64936529691 - 2² = 64936529687 is a prime.

Its product of digits (18895680) is a multiple of the sum of its prime divisors (729).

It is not an unprimeable number, because it can be changed into a prime (64936529291) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 176938590 + ... + 176938956.

It is an arithmetic number, because the mean of its divisors is an integer number (830649600).

Almost surely, 2^64936529691 is an apocalyptic number.

64936529691 is a deficient number, since it is larger than the sum of its proper divisors (41386619109).

64936529691 is a wasteful number, since it uses less digits than its factorization.

64936529691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729.

The product of its digits is 18895680, while the sum is 60.

The spelling of 64936529691 in words is "sixty-four billion, nine hundred thirty-six million, five hundred twenty-nine thousand, six hundred ninety-one".