664493715 has 12 divisors (see below), whose sum is σ = 1151789184. Its totient is φ = 354396624.

The previous prime is 664493689. The next prime is 664493717. The reversal of 664493715 is 517394466.

It is not a de Polignac number, because 664493715 - 2¹⁰ = 664492691 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 14766527 = 664493715 / (6 + 6 + 4 + 4 + 9 + 3 + 7 + 1 + 5).

It is not an unprimeable number, because it can be changed into a prime (664493717) 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, 7383219 + ... + 7383308.

It is an arithmetic number, because the mean of its divisors is an integer number (95982432).

Almost surely, 2^664493715 is an apocalyptic number.

664493715 is a deficient number, since it is larger than the sum of its proper divisors (487295469).

664493715 is a wasteful number, since it uses less digits than its factorization.

664493715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14766538 (or 14766535 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 664493715 is about 25777.7756022509. The cubic root of 664493715 is about 872.6303076012.

It can be divided in two parts, 6 and 64493715, that multiplied together give a triangular number (386962290 = T₂₇₈₁₉).

The spelling of 664493715 in words is "six hundred sixty-four million, four hundred ninety-three thousand, seven hundred fifteen".