664012761 has 8 divisors (see below), whose sum is σ = 885477504. Its totient is φ = 442611600.

The previous prime is 664012759. The next prime is 664012763. The reversal of 664012761 is 167210466.

664012761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (664012759) and next prime (664012763).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664012761 - 2¹ = 664012759 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664012763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20160 + ... + 41646.

It is an arithmetic number, because the mean of its divisors is an integer number (110684688).

Almost surely, 2^664012761 is an apocalyptic number.

It is an amenable number.

664012761 is a deficient number, since it is larger than the sum of its proper divisors (221464743).

664012761 is a wasteful number, since it uses less digits than its factorization.

664012761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31791.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 664012761 is about 25768.4450636821. The cubic root of 664012761 is about 872.4197230487.

The spelling of 664012761 in words is "six hundred sixty-four million, twelve thousand, seven hundred sixty-one".