64406442152 has 24 divisors (see below), whose sum is σ = 130766040990. Its totient is φ = 29726049600.

The previous prime is 64406442043. The next prime is 64406442181. The reversal of 64406442152 is 25124460446.

It can be written as a sum of positive squares in 3 ways, for example, as 35259075076 + 29147367076 = 187774^2 + 170726^2 .

It is a super-2 number, since 2×64406442152² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23817599 + ... + 23820302.

Almost surely, 2^64406442152 is an apocalyptic number.

It is an amenable number.

64406442152 is an abundant number, since it is smaller than the sum of its proper divisors (66359598838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64406442152 is a wasteful number, since it uses less digits than its factorization.

64406442152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47637933 (or 47637916 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 38.

The spelling of 64406442152 in words is "sixty-four billion, four hundred six million, four hundred forty-two thousand, one hundred fifty-two".