64621611406 has 16 divisors (see below), whose sum is σ = 108602414640. Its totient is φ = 28579582080.

The previous prime is 64621611389. The next prime is 64621611413. The reversal of 64621611406 is 60411612646.

It is a Harshad number since it is a multiple of its sum of digits (37).

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, 39693051 + ... + 39694678.

It is an arithmetic number, because the mean of its divisors is an integer number (6787650915).

Almost surely, 2^64621611406 is an apocalyptic number.

64621611406 is a deficient number, since it is larger than the sum of its proper divisors (43980803234).

64621611406 is a wasteful number, since it uses less digits than its factorization.

64621611406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79387779.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 64621611406 in words is "sixty-four billion, six hundred twenty-one million, six hundred eleven thousand, four hundred six".