65720588155 has 4 divisors (see below), whose sum is σ = 78864705792. Its totient is φ = 52576470520.

The previous prime is 65720588147. The next prime is 65720588161. The reversal of 65720588155 is 55188502756.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 65720588155 - 2³ = 65720588147 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, 6572058811 + ... + 6572058820.

It is an arithmetic number, because the mean of its divisors is an integer number (19716176448).

Almost surely, 2^65720588155 is an apocalyptic number.

65720588155 is a deficient number, since it is larger than the sum of its proper divisors (13144117637).

65720588155 is a wasteful number, since it uses less digits than its factorization.

65720588155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13144117636.

The product of its (nonzero) digits is 3360000, while the sum is 52.

The spelling of 65720588155 in words is "sixty-five billion, seven hundred twenty million, five hundred eighty-eight thousand, one hundred fifty-five".