865781141979 has 16 divisors (see below), whose sum is σ = 1273494214944. Its totient is φ = 519793555200.

The previous prime is 865781141977. The next prime is 865781141983. The reversal of 865781141979 is 979141187568.

It is not a de Polignac number, because 865781141979 - 2¹ = 865781141977 is a prime.

It is a super-2 number, since 2×865781141979² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (865781141977) 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, 270724212 + ... + 270727409.

It is an arithmetic number, because the mean of its divisors is an integer number (79593388434).

Almost surely, 2^865781141979 is an apocalyptic number.

865781141979 is a deficient number, since it is larger than the sum of its proper divisors (407713072965).

865781141979 is a wasteful number, since it uses less digits than its factorization.

865781141979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541451678.

The product of its digits is 30481920, while the sum is 66.

The spelling of 865781141979 in words is "eight hundred sixty-five billion, seven hundred eighty-one million, one hundred forty-one thousand, nine hundred seventy-nine".