865964955501 has 12 divisors (see below), whose sum is σ = 1267973040828. Its totient is φ = 569401614144.

The previous prime is 865964955491. The next prime is 865964955517. The reversal of 865964955501 is 105559469568.

865964955501 is a `hidden beast` number, since 8 + 6 + 5 + 96 + 495 + 5 + 50 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 708097005225 + 157867950276 = 841485^2 + 397326^2 .

It is not a de Polignac number, because 865964955501 - 2⁵ = 865964955469 is a prime.

It is a super-2 number, since 2×865964955501² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865964965501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 659028990 + ... + 659030303.

It is an arithmetic number, because the mean of its divisors is an integer number (105664420069).

Almost surely, 2^865964955501 is an apocalyptic number.

It is an amenable number.

865964955501 is a deficient number, since it is larger than the sum of its proper divisors (402008085327).

865964955501 is a wasteful number, since it uses less digits than its factorization.

865964955501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318059372 (or 1318059369 counting only the distinct ones).

The product of its (nonzero) digits is 58320000, while the sum is 63.

The spelling of 865964955501 in words is "eight hundred sixty-five billion, nine hundred sixty-four million, nine hundred fifty-five thousand, five hundred one".