77617905871 has 4 divisors (see below), whose sum is σ = 84674079144. Its totient is φ = 70561732600.

The previous prime is 77617905847. The next prime is 77617905901. The reversal of 77617905871 is 17850971677.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77617905871 - 2⁹ = 77617905359 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 (77617905821) 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, 3528086620 + ... + 3528086641.

It is an arithmetic number, because the mean of its divisors is an integer number (21168519786).

Almost surely, 2^77617905871 is an apocalyptic number.

77617905871 is a deficient number, since it is larger than the sum of its proper divisors (7056173273).

77617905871 is a wasteful number, since it uses less digits than its factorization.

77617905871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7056173272.

The product of its (nonzero) digits is 5186160, while the sum is 58.

The spelling of 77617905871 in words is "seventy-seven billion, six hundred seventeen million, nine hundred five thousand, eight hundred seventy-one".