720115551 has 6 divisors (see below), whose sum is σ = 1040166920. Its totient is φ = 480077028.

The previous prime is 720115541. The next prime is 720115601. The reversal of 720115551 is 155511027.

It is not a de Polignac number, because 720115551 - 2⁵ = 720115519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720115541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40006411 + ... + 40006428.

Almost surely, 2^720115551 is an apocalyptic number.

720115551 is a deficient number, since it is larger than the sum of its proper divisors (320051369).

720115551 is a wasteful number, since it uses less digits than its factorization.

720115551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80012845 (or 80012842 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 27.

The square root of 720115551 is about 26834.9688093726. The cubic root of 720115551 is about 896.3288940430.

Adding to 720115551 its reverse (155511027), we get a palindrome (875626578).

The spelling of 720115551 in words is "seven hundred twenty million, one hundred fifteen thousand, five hundred fifty-one".