64644440626426 has 4 divisors (see below), whose sum is σ = 96966660939642. Its totient is φ = 32322220313212.

The previous prime is 64644440626421. The next prime is 64644440626457. The reversal of 64644440626426 is 62462604444646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 32928947640625 + 31715492985801 = 5738375^2 + 5631651^2 .

It is not an unprimeable number, because it can be changed into a prime (64644440626421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16161110156605 + ... + 16161110156608.

Almost surely, 2^{64644440626426} is an apocalyptic number.

64644440626426 is a deficient number, since it is larger than the sum of its proper divisors (32322220313216).

64644440626426 is a wasteful number, since it uses less digits than its factorization.

64644440626426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32322220313215.

The product of its (nonzero) digits is 127401984, while the sum is 58.

The spelling of 64644440626426 in words is "sixty-four trillion, six hundred forty-four billion, four hundred forty million, six hundred twenty-six thousand, four hundred twenty-six".