64261540261444 has 24 divisors (see below), whose sum is σ = 112507874805368. Its totient is φ = 32116436029440.

The previous prime is 64261540261409. The next prime is 64261540261453. The reversal of 64261540261444 is 44416204516246.

It can be written as a sum of positive squares in 4 ways, for example, as 20792414416900 + 43469125844544 = 4559870^2 + 6593112^2 .

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, 90973264 + ... + 91676920.

Almost surely, 2^{64261540261444} is an apocalyptic number.

It is an amenable number.

64261540261444 is a deficient number, since it is larger than the sum of its proper divisors (48246334543924).

64261540261444 is a wasteful number, since it uses less digits than its factorization.

64261540261444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713815 (or 713813 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 49.

The spelling of 64261540261444 in words is "sixty-four trillion, two hundred sixty-one billion, five hundred forty million, two hundred sixty-one thousand, four hundred forty-four".