65516161657 has 8 divisors (see below), whose sum is σ = 66924833600. Its totient is φ = 64118284560.

The previous prime is 65516161631. The next prime is 65516161661. The reversal of 65516161657 is 75616161556.

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 65516161657 - 2¹¹ = 65516159609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65516161657.

It is not an unprimeable number, because it can be changed into a prime (65516161757) 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, 2686443 + ... + 2710720.

It is an arithmetic number, because the mean of its divisors is an integer number (8365604200).

Almost surely, 2^65516161657 is an apocalyptic number.

It is an amenable number.

65516161657 is a deficient number, since it is larger than the sum of its proper divisors (1408671943).

65516161657 is a wasteful number, since it uses less digits than its factorization.

65516161657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5397423.

The product of its digits is 1134000, while the sum is 49.

The spelling of 65516161657 in words is "sixty-five billion, five hundred sixteen million, one hundred sixty-one thousand, six hundred fifty-seven".