721135601536 has 64 divisors (see below), whose sum is σ = 1728285552000. Its totient is φ = 292791891456.

The previous prime is 721135601533. The next prime is 721135601567. The reversal of 721135601536 is 635106531127.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721135601533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21162946 + ... + 21196993.

It is an arithmetic number, because the mean of its divisors is an integer number (27004461750).

Almost surely, 2^721135601536 is an apocalyptic number.

721135601536 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

721135601536 is an abundant number, since it is smaller than the sum of its proper divisors (1007149950464).

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

721135601536 is a wasteful number, since it uses less digits than its factorization.

721135601536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42359979 (or 42359967 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 40.

The spelling of 721135601536 in words is "seven hundred twenty-one billion, one hundred thirty-five million, six hundred one thousand, five hundred thirty-six".