663970407291520 has 128 divisors (see below), whose sum is σ = 1909538953545600. Its totient is φ = 215665575874560.

The previous prime is 663970407291461. The next prime is 663970407291553. The reversal of 663970407291520 is 25192704079366.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3900116991 + ... + 3900287230.

It is an arithmetic number, because the mean of its divisors is an integer number (14918273074575).

Almost surely, 2^{663970407291520} is an apocalyptic number.

It is an amenable number.

663970407291520 is an abundant number, since it is smaller than the sum of its proper divisors (1245568546254080).

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

663970407291520 is a wasteful number, since it uses less digits than its factorization.

663970407291520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7800404266 (or 7800404254 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 61.

The spelling of 663970407291520 in words is "six hundred sixty-three trillion, nine hundred seventy billion, four hundred seven million, two hundred ninety-one thousand, five hundred twenty".