77923548709 has 8 divisors (see below), whose sum is σ = 82789232760. Its totient is φ = 73203109056.

The previous prime is 77923548697. The next prime is 77923548721. The reversal of 77923548709 is 90784532977.

It is an interprime number because it is at equal distance from previous prime (77923548697) and next prime (77923548721).

It can be written as a sum of positive squares in 4 ways, for example, as 36094300225 + 41829248484 = 189985^2 + 204522^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77923548709 - 2²³ = 77915160101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77923548739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36309994 + ... + 36312139.

It is an arithmetic number, because the mean of its divisors is an integer number (10348654095).

Almost surely, 2^77923548709 is an apocalyptic number.

It is an amenable number.

77923548709 is a deficient number, since it is larger than the sum of its proper divisors (4865684051).

77923548709 is a wasteful number, since it uses less digits than its factorization.

77923548709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72622199.

The product of its (nonzero) digits is 26671680, while the sum is 61.

The spelling of 77923548709 in words is "seventy-seven billion, nine hundred twenty-three million, five hundred forty-eight thousand, seven hundred nine".