77157321718 has 16 divisors (see below), whose sum is σ = 116273386944. Its totient is φ = 38399917320.

The previous prime is 77157321701. The next prime is 77157321743. The reversal of 77157321718 is 81712375177.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298921 + ... + 493627.

It is an arithmetic number, because the mean of its divisors is an integer number (7267086684).

Almost surely, 2^77157321718 is an apocalyptic number.

77157321718 is a deficient number, since it is larger than the sum of its proper divisors (39116065226).

77157321718 is a wasteful number, since it uses less digits than its factorization.

77157321718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195627.

The product of its digits is 576240, while the sum is 49.

The spelling of 77157321718 in words is "seventy-seven billion, one hundred fifty-seven million, three hundred twenty-one thousand, seven hundred eighteen".