64690666005 has 32 divisors (see below), whose sum is σ = 124517376000. Its totient is φ = 28016407872.

The previous prime is 64690665997. The next prime is 64690666013. The reversal of 64690666005 is 50066609646.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64690665997) and next prime (64690666013).

It is not a de Polignac number, because 64690666005 - 2³ = 64690665997 is a prime.

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, 16211205 + ... + 16215194.

It is an arithmetic number, because the mean of its divisors is an integer number (3891168000).

Almost surely, 2^64690666005 is an apocalyptic number.

It is an amenable number.

64690666005 is a deficient number, since it is larger than the sum of its proper divisors (59826709995).

64690666005 is a wasteful number, since it uses less digits than its factorization.

64690666005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32426433.

The product of its (nonzero) digits is 1399680, while the sum is 48.

The spelling of 64690666005 in words is "sixty-four billion, six hundred ninety million, six hundred sixty-six thousand, five".