77825966979 has 16 divisors (see below), whose sum is σ = 104337676800. Its totient is φ = 51599683296.

The previous prime is 77825966941. The next prime is 77825966983. The reversal of 77825966979 is 97966952877.

It is not a de Polignac number, because 77825966979 - 2⁷ = 77825966851 is a prime.

It is a super-2 number, since 2×77825966979² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77825966979.

It is not an unprimeable number, because it can be changed into a prime (77825966279) 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, 484032 + ... + 624450.

It is an arithmetic number, because the mean of its divisors is an integer number (6521104800).

Almost surely, 2^77825966979 is an apocalyptic number.

77825966979 is a deficient number, since it is larger than the sum of its proper divisors (26511709821).

77825966979 is a wasteful number, since it uses less digits than its factorization.

77825966979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141434.

The product of its digits is 720135360, while the sum is 75.

The spelling of 77825966979 in words is "seventy-seven billion, eight hundred twenty-five million, nine hundred sixty-six thousand, nine hundred seventy-nine".