861152609779 has 16 divisors (see below), whose sum is σ = 1075831508736. Its totient is φ = 669661322400.

The previous prime is 861152609771. The next prime is 861152609819. The reversal of 861152609779 is 977906251168.

It is not a de Polignac number, because 861152609779 - 2³ = 861152609771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861152609771) 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, 11350992 + ... + 11426605.

It is an arithmetic number, because the mean of its divisors is an integer number (67239469296).

Almost surely, 2^861152609779 is an apocalyptic number.

861152609779 is a deficient number, since it is larger than the sum of its proper divisors (214678898957).

861152609779 is a wasteful number, since it uses less digits than its factorization.

861152609779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22778106.

The product of its (nonzero) digits is 11430720, while the sum is 61.

The spelling of 861152609779 in words is "eight hundred sixty-one billion, one hundred fifty-two million, six hundred nine thousand, seven hundred seventy-nine".