861749292475 has 12 divisors (see below), whose sum is σ = 1068784410384. Its totient is φ = 689260538720.

The previous prime is 861749292473. The next prime is 861749292553. The reversal of 861749292475 is 574292947168.

It is not a de Polignac number, because 861749292475 - 2¹ = 861749292473 is a prime.

It is a super-2 number, since 2×861749292475² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861749292473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3345724 + ... + 3594073.

It is an arithmetic number, because the mean of its divisors is an integer number (89065367532).

Almost surely, 2^861749292475 is an apocalyptic number.

861749292475 is a deficient number, since it is larger than the sum of its proper divisors (207035117909).

861749292475 is a wasteful number, since it uses less digits than its factorization.

861749292475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6944774 (or 6944769 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 64.

The spelling of 861749292475 in words is "eight hundred sixty-one billion, seven hundred forty-nine million, two hundred ninety-two thousand, four hundred seventy-five".