65720124661 has 8 divisors (see below), whose sum is σ = 66796221024. Its totient is φ = 64646828400.

The previous prime is 65720124623. The next prime is 65720124667. The reversal of 65720124661 is 16642102756.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65720124661 - 2²³ = 65711736053 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 (65720124667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 652675 + ... + 746608.

It is an arithmetic number, because the mean of its divisors is an integer number (8349527628).

Almost surely, 2^65720124661 is an apocalyptic number.

It is an amenable number.

65720124661 is a deficient number, since it is larger than the sum of its proper divisors (1076096363).

65720124661 is a wasteful number, since it uses less digits than its factorization.

65720124661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400051.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 65720124661 in words is "sixty-five billion, seven hundred twenty million, one hundred twenty-four thousand, six hundred sixty-one".