721636033361145 has 16 divisors (see below), whose sum is σ = 1319563032432000. Its totient is φ = 329890758107904.

The previous prime is 721636033361123. The next prime is 721636033361207. The reversal of 721636033361145 is 541163330636127.

It is not a de Polignac number, because 721636033361145 - 2⁶ = 721636033361081 is a prime.

It is a super-2 number, since 2×721636033361145² (a number of 31 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3436362063520 + ... + 3436362063729.

It is an arithmetic number, because the mean of its divisors is an integer number (82472689527000).

Almost surely, 2^{721636033361145} is an apocalyptic number.

It is an amenable number.

721636033361145 is a deficient number, since it is larger than the sum of its proper divisors (597926999070855).

721636033361145 is a wasteful number, since it uses less digits than its factorization.

721636033361145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6872724127264.

The product of its (nonzero) digits is 4898880, while the sum is 51.

The spelling of 721636033361145 in words is "seven hundred twenty-one trillion, six hundred thirty-six billion, thirty-three million, three hundred sixty-one thousand, one hundred forty-five".