77666115021 has 8 divisors (see below), whose sum is σ = 112968894624. Its totient is φ = 47070372720.

The previous prime is 77666115011. The next prime is 77666115047. The reversal of 77666115021 is 12051166677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77666115021 - 2¹⁹ = 77665590733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77666115001) 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, 1176759286 + ... + 1176759351.

It is an arithmetic number, because the mean of its divisors is an integer number (14121111828).

Almost surely, 2^77666115021 is an apocalyptic number.

It is an amenable number.

77666115021 is a deficient number, since it is larger than the sum of its proper divisors (35302779603).

77666115021 is a wasteful number, since it uses less digits than its factorization.

77666115021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353518651.

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 77666115021 in words is "seventy-seven billion, six hundred sixty-six million, one hundred fifteen thousand, twenty-one".