721645466160 has 80 divisors (see below), whose sum is σ = 2237202497376. Its totient is φ = 192430055424.

The previous prime is 721645466153. The next prime is 721645466161. The reversal of 721645466160 is 61664546127.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (721645466161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6573642 + ... + 6682518.

Almost surely, 2^721645466160 is an apocalyptic number.

It is an amenable number.

721645466160 is an abundant number, since it is smaller than the sum of its proper divisors (1515557031216).

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

721645466160 is a wasteful number, since it uses less digits than its factorization.

721645466160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136510 (or 136504 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 721645466160 in words is "seven hundred twenty-one billion, six hundred forty-five million, four hundred sixty-six thousand, one hundred sixty".