664111651 has 12 divisors (see below), whose sum is σ = 790506552. Its totient is φ = 555998688.

The previous prime is 664111633. The next prime is 664111661. The reversal of 664111651 is 156111466.

It is not a de Polignac number, because 664111651 - 2⁷ = 664111523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664111661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155490 + ... + 159703.

It is an arithmetic number, because the mean of its divisors is an integer number (65875546).

Almost surely, 2^664111651 is an apocalyptic number.

664111651 is a deficient number, since it is larger than the sum of its proper divisors (126394901).

664111651 is a wasteful number, since it uses less digits than its factorization.

664111651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315250 (or 315243 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 664111651 is about 25770.3638119449. The cubic root of 664111651 is about 872.4630300999.

The spelling of 664111651 in words is "six hundred sixty-four million, one hundred eleven thousand, six hundred fifty-one".