68942479761 has 9 divisors (see below), whose sum is σ = 99584719689. Its totient is φ = 45961128036.

The previous prime is 68942479751. The next prime is 68942479789. The reversal of 68942479761 is 16797424986.

The square root of 68942479761 is 262569.

It is a perfect power (a square), and thus also a powerful number.

68942479761 is a `hidden beast` number, since 6 + 8 + 94 + 2 + 479 + 76 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 68942479761 - 2⁷ = 68942479633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68942479751) 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 8 ways as a sum of consecutive naturals, for example, 743946 + ... + 831468.

Almost surely, 2^68942479761 is an apocalyptic number.

68942479761 is the 262569-th square number.

68942479761 is the 131285-th centered octagonal number.

It is an amenable number.

68942479761 is a deficient number, since it is larger than the sum of its proper divisors (30642239928).

68942479761 is an frugal number, since it uses more digits than its factorization.

68942479761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175052 (or 87526 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The spelling of 68942479761 in words is "sixty-eight billion, nine hundred forty-two million, four hundred seventy-nine thousand, seven hundred sixty-one".