664612377771 has 32 divisors (see below), whose sum is σ = 933799426560. Its totient is φ = 419893415424.

The previous prime is 664612377761. The next prime is 664612377773. The reversal of 664612377771 is 177773216466.

It is not a de Polignac number, because 664612377771 - 2⁵ = 664612377739 is a prime.

It is a super-2 number, since 2×664612377771² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664612377773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 684420 + ... + 1340766.

It is an arithmetic number, because the mean of its divisors is an integer number (29181232080).

Almost surely, 2^664612377771 is an apocalyptic number.

664612377771 is a deficient number, since it is larger than the sum of its proper divisors (269187048789).

664612377771 is a wasteful number, since it uses less digits than its factorization.

664612377771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656595.

The product of its digits is 12446784, while the sum is 57.

The spelling of 664612377771 in words is "six hundred sixty-four billion, six hundred twelve million, three hundred seventy-seven thousand, seven hundred seventy-one".