79770042487 has 4 divisors (see below), whose sum is σ = 82343269696. Its totient is φ = 77196815280.

The previous prime is 79770042479. The next prime is 79770042503. The reversal of 79770042487 is 78424007797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78424007797 = 17123 ⋅4580039.

It is a cyclic number.

It is not a de Polignac number, because 79770042487 - 2³ = 79770042479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79770042887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1286613558 + ... + 1286613619.

It is an arithmetic number, because the mean of its divisors is an integer number (20585817424).

Almost surely, 2^79770042487 is an apocalyptic number.

79770042487 is a deficient number, since it is larger than the sum of its proper divisors (2573227209).

79770042487 is a wasteful number, since it uses less digits than its factorization.

79770042487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573227208.

The product of its (nonzero) digits is 5531904, while the sum is 55.

The spelling of 79770042487 in words is "seventy-nine billion, seven hundred seventy million, forty-two thousand, four hundred eighty-seven".