720231897555 has 16 divisors (see below), whose sum is σ = 1280412262560. Its totient is φ = 384123678624.

The previous prime is 720231897551. The next prime is 720231897607. The reversal of 720231897555 is 555798132027.

720231897555 is a `hidden beast` number, since 7 + 2 + 0 + 2 + 3 + 1 + 89 + 7 + 555 = 666.

It is not a de Polignac number, because 720231897555 - 2² = 720231897551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (720231897551) 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, 2667525412 + ... + 2667525681.

It is an arithmetic number, because the mean of its divisors is an integer number (80025766410).

Almost surely, 2^720231897555 is an apocalyptic number.

720231897555 is a deficient number, since it is larger than the sum of its proper divisors (560180365005).

720231897555 is a wasteful number, since it uses less digits than its factorization.

720231897555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5335051107 (or 5335051101 counting only the distinct ones).

The product of its (nonzero) digits is 5292000, while the sum is 54.

The spelling of 720231897555 in words is "seven hundred twenty billion, two hundred thirty-one million, eight hundred ninety-seven thousand, five hundred fifty-five".