64666466646 has 64 divisors (see below), whose sum is σ = 131793426432. Its totient is φ = 21150000000.

The previous prime is 64666466633. The next prime is 64666466659.

64666466646 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (64666466633) and next prime (64666466659).

It is a self number, because there is not a number n which added to its sum of digits gives 64666466646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68720536 + ... + 68721476.

It is an arithmetic number, because the mean of its divisors is an integer number (2059272288).

Almost surely, 2^64666466646 is an apocalyptic number.

64666466646 is an abundant number, since it is smaller than the sum of its proper divisors (67126959786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64666466646 is a wasteful number, since it uses less digits than its factorization.

64666466646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949.

The product of its digits is 107495424, while the sum is 60.

The spelling of 64666466646 in words is "sixty-four billion, six hundred sixty-six million, four hundred sixty-six thousand, six hundred forty-six".