77842681593 has 4 divisors (see below), whose sum is σ = 103790242128. Its totient is φ = 51895121060.

The previous prime is 77842681589. The next prime is 77842681597. The reversal of 77842681593 is 39518624877.

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.

It is an interprime number because it is at equal distance from previous prime (77842681589) and next prime (77842681597).

It is a cyclic number.

It is not a de Polignac number, because 77842681593 - 2² = 77842681589 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77842681597) 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, 12973780263 + ... + 12973780268.

It is an arithmetic number, because the mean of its divisors is an integer number (25947560532).

Almost surely, 2^77842681593 is an apocalyptic number.

It is an amenable number.

77842681593 is a deficient number, since it is larger than the sum of its proper divisors (25947560535).

77842681593 is a wasteful number, since it uses less digits than its factorization.

77842681593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25947560534.

The product of its digits is 20321280, while the sum is 60.

The spelling of 77842681593 in words is "seventy-seven billion, eight hundred forty-two million, six hundred eighty-one thousand, five hundred ninety-three".