720697999917 has 16 divisors (see below), whose sum is σ = 1102801489920. Its totient is φ = 410104298352.

The previous prime is 720697999891. The next prime is 720697999919. The reversal of 720697999917 is 719999796027.

It is not a de Polignac number, because 720697999917 - 2¹⁶ = 720697934381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720697999919) 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, 71791953 + ... + 71801990.

It is an arithmetic number, because the mean of its divisors is an integer number (68925093120).

Almost surely, 2^720697999917 is an apocalyptic number.

It is an amenable number.

720697999917 is a deficient number, since it is larger than the sum of its proper divisors (382103490003).

720697999917 is a wasteful number, since it uses less digits than its factorization.

720697999917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143594192.

The product of its (nonzero) digits is 243045684, while the sum is 75.

The spelling of 720697999917 in words is "seven hundred twenty billion, six hundred ninety-seven million, nine hundred ninety-nine thousand, nine hundred seventeen".