755779977557 has 6 divisors (see below), whose sum is σ = 830733363894. Its totient is φ = 687072706760.

The previous prime is 755779977553. The next prime is 755779977599.

It is a happy number.

755779977557 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 706475551441 + 49304426116 = 840521^2 + 222046^2 .

It is not a de Polignac number, because 755779977557 - 2² = 755779977553 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 (755779977553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3123057638 + ... + 3123057879.

It is an arithmetic number, because the mean of its divisors is an integer number (138455560649).

Almost surely, 2^755779977557 is an apocalyptic number.

It is an amenable number.

755779977557 is a deficient number, since it is larger than the sum of its proper divisors (74953386337).

755779977557 is a wasteful number, since it uses less digits than its factorization.

755779977557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6246115539 (or 6246115528 counting only the distinct ones).

The product of its digits is 5955980625, while the sum is 80.

The spelling of 755779977557 in words is "seven hundred fifty-five billion, seven hundred seventy-nine million, nine hundred seventy-seven thousand, five hundred fifty-seven".