64400444626 has 16 divisors (see below), whose sum is σ = 110529305280. Its totient is φ = 27568054800.

The previous prime is 64400444569. The next prime is 64400444651. The reversal of 64400444626 is 62644400446.

It is a happy 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, 2665525 + ... + 2689576.

It is an arithmetic number, because the mean of its divisors is an integer number (6908081580).

Almost surely, 2^64400444626 is an apocalyptic number.

64400444626 is a deficient number, since it is larger than the sum of its proper divisors (46128860654).

64400444626 is a wasteful number, since it uses less digits than its factorization.

64400444626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5355969.

The product of its (nonzero) digits is 442368, while the sum is 40.

The spelling of 64400444626 in words is "sixty-four billion, four hundred million, four hundred forty-four thousand, six hundred twenty-six".