77918442125 has 16 divisors (see below), whose sum is σ = 97309093440. Its totient is φ = 62291883600.

The previous prime is 77918442101. The next prime is 77918442131. The reversal of 77918442125 is 52124481977.

It is a happy number.

It is not a de Polignac number, because 77918442125 - 2¹⁰ = 77918441101 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31247 + ... + 395996.

It is an arithmetic number, because the mean of its divisors is an integer number (6081818340).

Almost surely, 2^77918442125 is an apocalyptic number.

It is an amenable number.

77918442125 is a deficient number, since it is larger than the sum of its proper divisors (19390651315).

77918442125 is a wasteful number, since it uses less digits than its factorization.

77918442125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428717 (or 428707 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 50.

The spelling of 77918442125 in words is "seventy-seven billion, nine hundred eighteen million, four hundred forty-two thousand, one hundred twenty-five".