861326542923 has 16 divisors (see below), whose sum is σ = 1431815552256. Its totient is φ = 447442359840.

The previous prime is 861326542907. The next prime is 861326542933. The reversal of 861326542923 is 329245623168.

It is not a de Polignac number, because 861326542923 - 2⁴ = 861326542907 is a prime.

It is a super-2 number, since 2×861326542923² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (861326542933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1864342936 + ... + 1864343397.

It is an arithmetic number, because the mean of its divisors is an integer number (89488472016).

Almost surely, 2^861326542923 is an apocalyptic number.

861326542923 is a deficient number, since it is larger than the sum of its proper divisors (570489009333).

861326542923 is a wasteful number, since it uses less digits than its factorization.

861326542923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3728686354.

The product of its digits is 3732480, while the sum is 51.

The spelling of 861326542923 in words is "eight hundred sixty-one billion, three hundred twenty-six million, five hundred forty-two thousand, nine hundred twenty-three".