720556955 has 4 divisors (see below), whose sum is σ = 864668352. Its totient is φ = 576445560.

The previous prime is 720556933. The next prime is 720556961. The reversal of 720556955 is 559655027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 559655027 = 3659 ⋅152953.

It is not a de Polignac number, because 720556955 - 2¹⁴ = 720540571 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72055691 + ... + 72055700.

It is an arithmetic number, because the mean of its divisors is an integer number (216167088).

Almost surely, 2^720556955 is an apocalyptic number.

720556955 is a deficient number, since it is larger than the sum of its proper divisors (144111397).

720556955 is a wasteful number, since it uses less digits than its factorization.

720556955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144111396.

The product of its (nonzero) digits is 472500, while the sum is 44.

The square root of 720556955 is about 26843.1919674244. The cubic root of 720556955 is about 896.5119953744.

The spelling of 720556955 in words is "seven hundred twenty million, five hundred fifty-six thousand, nine hundred fifty-five".