77151121617556 has 48 divisors (see below), whose sum is σ = 155671843041792. Its totient is φ = 32771903205600.

The previous prime is 77151121617553. The next prime is 77151121617601. The reversal of 77151121617556 is 65571612115177.

It is a junction number, because it is equal to n+sod(n) for n = 77151121617497 and 77151121617506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77151121617553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9992926 + ... + 15942421.

It is an arithmetic number, because the mean of its divisors is an integer number (3243163396704).

Almost surely, 2^{77151121617556} is an apocalyptic number.

It is an amenable number.

77151121617556 is an abundant number, since it is smaller than the sum of its proper divisors (78520721424236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77151121617556 is a wasteful number, since it uses less digits than its factorization.

77151121617556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25936300 (or 25936298 counting only the distinct ones).

The product of its digits is 3087000, while the sum is 55.

The spelling of 77151121617556 in words is "seventy-seven trillion, one hundred fifty-one billion, one hundred twenty-one million, six hundred seventeen thousand, five hundred fifty-six".