64644440626456 has 16 divisors (see below), whose sum is σ = 124164626813640. Its totient is φ = 31533873476160.

The previous prime is 64644440626421. The next prime is 64644440626457. The reversal of 64644440626456 is 65462604444646.

It is a junction number, because it is equal to n+sod(n) for n = 64644440626394 and 64644440626403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64644440626457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98543354286 + ... + 98543354941.

Almost surely, 2^{64644440626456} is an apocalyptic number.

It is an amenable number.

64644440626456 is a deficient number, since it is larger than the sum of its proper divisors (59520186187184).

64644440626456 is a wasteful number, since it uses less digits than its factorization.

64644440626456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197086709274 (or 197086709270 counting only the distinct ones).

The product of its (nonzero) digits is 318504960, while the sum is 61.

The spelling of 64644440626456 in words is "sixty-four trillion, six hundred forty-four billion, four hundred forty million, six hundred twenty-six thousand, four hundred fifty-six".