65720370861 has 24 divisors (see below), whose sum is σ = 97020668160. Its totient is φ = 42849766176.

The previous prime is 65720370827. The next prime is 65720370871. The reversal of 65720370861 is 16807302756.

65720370861 is a `hidden beast` number, since 6 + 572 + 0 + 3 + 70 + 8 + 6 + 1 = 666.

It is not a de Polignac number, because 65720370861 - 2¹⁰ = 65720369837 is a prime.

It is a super-2 number, since 2×65720370861² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65720370871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 524200 + ... + 637358.

It is an arithmetic number, because the mean of its divisors is an integer number (4042527840).

Almost surely, 2^65720370861 is an apocalyptic number.

It is an amenable number.

65720370861 is a deficient number, since it is larger than the sum of its proper divisors (31300297299).

65720370861 is a wasteful number, since it uses less digits than its factorization.

65720370861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114585 (or 114582 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 65720370861 in words is "sixty-five billion, seven hundred twenty million, three hundred seventy thousand, eight hundred sixty-one".