664642624247 has 16 divisors (see below), whose sum is σ = 762636936960. Its totient is φ = 567410178048.

The previous prime is 664642624241. The next prime is 664642624271. The reversal of 664642624247 is 742426246466.

It is not a de Polignac number, because 664642624247 - 2⁸ = 664642623991 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 (664642624241) 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, 20814668 + ... + 20846574.

It is an arithmetic number, because the mean of its divisors is an integer number (47664808560).

Almost surely, 2^664642624247 is an apocalyptic number.

664642624247 is a deficient number, since it is larger than the sum of its proper divisors (97994312713).

664642624247 is a wasteful number, since it uses less digits than its factorization.

664642624247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43750.

The product of its digits is 18579456, while the sum is 53.

The spelling of 664642624247 in words is "six hundred sixty-four billion, six hundred forty-two million, six hundred twenty-four thousand, two hundred forty-seven".