664758425643 has 32 divisors (see below), whose sum is σ = 955748408832. Its totient is φ = 408558163200.

The previous prime is 664758425587. The next prime is 664758425687. The reversal of 664758425643 is 346524857466.

It is not a de Polignac number, because 664758425643 - 2⁶ = 664758425579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664758405643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149147071 + ... + 149151527.

It is an arithmetic number, because the mean of its divisors is an integer number (29867137776).

Almost surely, 2^664758425643 is an apocalyptic number.

664758425643 is a deficient number, since it is larger than the sum of its proper divisors (290989983189).

664758425643 is a wasteful number, since it uses less digits than its factorization.

664758425643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8515.

The product of its digits is 116121600, while the sum is 60.

The spelling of 664758425643 in words is "six hundred sixty-four billion, seven hundred fifty-eight million, four hundred twenty-five thousand, six hundred forty-three".