861477881467 has 4 divisors (see below), whose sum is σ = 984546150256. Its totient is φ = 738409612680.

The previous prime is 861477881441. The next prime is 861477881471. The reversal of 861477881467 is 764188774168.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861477881467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861477881477) 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, 61534134384 + ... + 61534134397.

It is an arithmetic number, because the mean of its divisors is an integer number (246136537564).

Almost surely, 2^861477881467 is an apocalyptic number.

861477881467 is a deficient number, since it is larger than the sum of its proper divisors (123068268789).

861477881467 is a wasteful number, since it uses less digits than its factorization.

861477881467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123068268788.

The product of its digits is 101154816, while the sum is 67.

The spelling of 861477881467 in words is "eight hundred sixty-one billion, four hundred seventy-seven million, eight hundred eighty-one thousand, four hundred sixty-seven".