77218573577 has 4 divisors (see below), whose sum is σ = 77221697280. Its totient is φ = 77215449876.

The previous prime is 77218573529. The next prime is 77218573591. The reversal of 77218573577 is 77537581277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77537581277 = 13 ⋅5964429329.

It is a cyclic number.

It is not a de Polignac number, because 77218573577 - 2²² = 77214379273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77218573507) 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, 1524473 + ... + 1574310.

It is an arithmetic number, because the mean of its divisors is an integer number (19305424320).

Almost surely, 2^77218573577 is an apocalyptic number.

It is an amenable number.

77218573577 is a deficient number, since it is larger than the sum of its proper divisors (3123703).

77218573577 is a wasteful number, since it uses less digits than its factorization.

77218573577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123702.

The product of its digits is 20168400, while the sum is 59.

The spelling of 77218573577 in words is "seventy-seven billion, two hundred eighteen million, five hundred seventy-three thousand, five hundred seventy-seven".