64436644663446 has 16 divisors (see below), whose sum is σ = 140589042902208. Its totient is φ = 19526255958600.

The previous prime is 64436644663439. The next prime is 64436644663493.

64436644663446 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66), and also a Moran number because the ratio is a prime number: 976312797931 = 64436644663446 / (6 + 4 + 4 + 3 + 6 + 6 + 4 + 4 + 6 + 6 + 3 + 4 + 4 + 6).

It is a congruent 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, 488156398900 + ... + 488156399031.

It is an arithmetic number, because the mean of its divisors is an integer number (8786815181388).

Almost surely, 2^{64436644663446} is an apocalyptic number.

64436644663446 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

64436644663446 is an abundant number, since it is smaller than the sum of its proper divisors (76152398238762).

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

64436644663446 is a wasteful number, since it uses less digits than its factorization.

64436644663446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976312797947.

The product of its digits is 1719926784, while the sum is 66.

The spelling of 64436644663446 in words is "sixty-four trillion, four hundred thirty-six billion, six hundred forty-four million, six hundred sixty-three thousand, four hundred forty-six".