861577065 has 12 divisors (see below), whose sum is σ = 1493400324. Its totient is φ = 459507744.

The previous prime is 861577061. The next prime is 861577103. The reversal of 861577065 is 560775168.

It can be written as a sum of positive squares in 2 ways, for example, as 241118784 + 620458281 = 15528^2 + 24909^2 .

It is not a de Polignac number, because 861577065 - 2² = 861577061 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 19146157 = 861577065 / (8 + 6 + 1 + 5 + 7 + 7 + 0 + 6 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 861577065.

It is not an unprimeable number, because it can be changed into a prime (861577061) 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, 9573034 + ... + 9573123.

It is an arithmetic number, because the mean of its divisors is an integer number (124450027).

Almost surely, 2^861577065 is an apocalyptic number.

It is an amenable number.

861577065 is a deficient number, since it is larger than the sum of its proper divisors (631823259).

861577065 is a wasteful number, since it uses less digits than its factorization.

861577065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19146168 (or 19146165 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The square root of 861577065 is about 29352.6330164774. The cubic root of 861577065 is about 951.5494806068.

The spelling of 861577065 in words is "eight hundred sixty-one million, five hundred seventy-seven thousand, sixty-five".