77488747021 has 8 divisors (see below), whose sum is σ = 89880338240. Its totient is φ = 65427598368.

The previous prime is 77488747009. The next prime is 77488747087. The reversal of 77488747021 is 12074788477.

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 77488747021 - 2¹⁵ = 77488714253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77488747001) 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, 82610136 + ... + 82611073.

It is an arithmetic number, because the mean of its divisors is an integer number (11235042280).

Almost surely, 2^77488747021 is an apocalyptic number.

It is an amenable number.

77488747021 is a deficient number, since it is larger than the sum of its proper divisors (12391591219).

77488747021 is a wasteful number, since it uses less digits than its factorization.

77488747021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165221283.

The product of its (nonzero) digits is 4917248, while the sum is 55.

The spelling of 77488747021 in words is "seventy-seven billion, four hundred eighty-eight million, seven hundred forty-seven thousand, twenty-one".