664120767 has 16 divisors (see below), whose sum is σ = 907660160. Its totient is φ = 431700192.

The previous prime is 664120741. The next prime is 664120771. The reversal of 664120767 is 767021466.

It is not a de Polignac number, because 664120767 - 2¹⁵ = 664087999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664120777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75693 + ... + 84009.

It is an arithmetic number, because the mean of its divisors is an integer number (56728760).

Almost surely, 2^664120767 is an apocalyptic number.

664120767 is a deficient number, since it is larger than the sum of its proper divisors (243539393).

664120767 is a wasteful number, since it uses less digits than its factorization.

664120767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8982.

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 664120767 is about 25770.5406811731. The cubic root of 664120767 is about 872.4670220675.

The spelling of 664120767 in words is "six hundred sixty-four million, one hundred twenty thousand, seven hundred sixty-seven".