720644161601 has 16 divisors (see below), whose sum is σ = 886980670464. Its totient is φ = 570158132544.

The previous prime is 720644161583. The next prime is 720644161637. The reversal of 720644161601 is 106161446027.

It is not a de Polignac number, because 720644161601 - 2¹⁴ = 720644145217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (720644161651) 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, 2484560 + ... + 2759406.

It is an arithmetic number, because the mean of its divisors is an integer number (55436291904).

Almost surely, 2^720644161601 is an apocalyptic number.

It is an amenable number.

720644161601 is a deficient number, since it is larger than the sum of its proper divisors (166336508863).

720644161601 is a wasteful number, since it uses less digits than its factorization.

720644161601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303680.

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 720644161601 in words is "seven hundred twenty billion, six hundred forty-four million, one hundred sixty-one thousand, six hundred one".