64402640630434 has 8 divisors (see below), whose sum is σ = 96604222348188. Its totient is φ = 32201233181040.

The previous prime is 64402640630413. The next prime is 64402640630563. The reversal of 64402640630434 is 43403604620446.

It can be written as a sum of positive squares in 2 ways, for example, as 36738690950025 + 27663949680409 = 6061245^2 + 5259653^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42639237 + ... + 44123800.

Almost surely, 2^{64402640630434} is an apocalyptic number.

64402640630434 is a deficient number, since it is larger than the sum of its proper divisors (32201581717754).

64402640630434 is a wasteful number, since it uses less digits than its factorization.

64402640630434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87134180.

The product of its (nonzero) digits is 3981312, while the sum is 46.

The spelling of 64402640630434 in words is "sixty-four trillion, four hundred two billion, six hundred forty million, six hundred thirty thousand, four hundred thirty-four".