65990791605 has 16 divisors (see below), whose sum is σ = 105594482304. Its totient is φ = 35192016960.

The previous prime is 65990791597. The next prime is 65990791609. The reversal of 65990791605 is 50619709956.

It is not a de Polignac number, because 65990791605 - 2³ = 65990791597 is a prime.

It is a super-3 number, since 3×65990791605³ (a number of 33 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65990791609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8769 + ... + 363398.

It is an arithmetic number, because the mean of its divisors is an integer number (6599655144).

Almost surely, 2^65990791605 is an apocalyptic number.

It is an amenable number.

65990791605 is a deficient number, since it is larger than the sum of its proper divisors (39603690699).

65990791605 is a wasteful number, since it uses less digits than its factorization.

65990791605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383996.

The product of its (nonzero) digits is 4592700, while the sum is 57.

The spelling of 65990791605 in words is "sixty-five billion, nine hundred ninety million, seven hundred ninety-one thousand, six hundred five".