77758742969 has 4 divisors (see below), whose sum is σ = 77788549620. Its totient is φ = 77728936320.

The previous prime is 77758742959. The next prime is 77758742983. The reversal of 77758742969 is 96924785777.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44399546944 + 33359196025 = 210712^2 + 182645^2 .

It is a cyclic number.

It is not a de Polignac number, because 77758742969 - 2²⁸ = 77490307513 is a prime.

It is a super-2 number, since 2×77758742969² (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 (77758742959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14899412 + ... + 14904629.

It is an arithmetic number, because the mean of its divisors is an integer number (19447137405).

Almost surely, 2^77758742969 is an apocalyptic number.

It is an amenable number.

77758742969 is a deficient number, since it is larger than the sum of its proper divisors (29806651).

77758742969 is a wasteful number, since it uses less digits than its factorization.

77758742969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29806650.

The product of its digits is 373403520, while the sum is 71.

The spelling of 77758742969 in words is "seventy-seven billion, seven hundred fifty-eight million, seven hundred forty-two thousand, nine hundred sixty-nine".