664551402421740 has 48 divisors (see below), whose sum is σ = 1860826013783520. Its totient is φ = 177205889502720.

The previous prime is 664551402421729. The next prime is 664551402421741. The reversal of 664551402421740 is 47124204155466.

It is not an unprimeable number, because it can be changed into a prime (664551402421741) 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, 242935081 + ... + 245655360.

It is an arithmetic number, because the mean of its divisors is an integer number (38767208620490).

Almost surely, 2^{664551402421740} is an apocalyptic number.

664551402421740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664551402421740 is an abundant number, since it is smaller than the sum of its proper divisors (1196274611361780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664551402421740 is a wasteful number, since it uses less digits than its factorization.

664551402421740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488613122 (or 488613120 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 51.

The spelling of 664551402421740 in words is "six hundred sixty-four trillion, five hundred fifty-one billion, four hundred two million, four hundred twenty-one thousand, seven hundred forty".