77755279979 has 16 divisors (see below), whose sum is σ = 87197651520. Its totient is φ = 68840150400.

The previous prime is 77755279967. The next prime is 77755279997. The reversal of 77755279979 is 97997255777.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77755279979 is a prime.

It is a super-2 number, since 2×77755279979² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77755279939) 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, 626012 + ... + 739865.

It is an arithmetic number, because the mean of its divisors is an integer number (5449853220).

Almost surely, 2^77755279979 is an apocalyptic number.

77755279979 is a deficient number, since it is larger than the sum of its proper divisors (9442371541).

77755279979 is a wasteful number, since it uses less digits than its factorization.

77755279979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366070.

The product of its digits is 612615150, while the sum is 74.

The spelling of 77755279979 in words is "seventy-seven billion, seven hundred fifty-five million, two hundred seventy-nine thousand, nine hundred seventy-nine".