877812082561 has 4 divisors (see below), whose sum is σ = 879230196400. Its totient is φ = 876393968724.

The previous prime is 877812082547. The next prime is 877812082579. The reversal of 877812082561 is 165280218778.

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 a cyclic number.

It is not a de Polignac number, because 877812082561 - 2²⁹ = 877275211649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (877812082361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 709055991 + ... + 709057228.

It is an arithmetic number, because the mean of its divisors is an integer number (219807549100).

Almost surely, 2^877812082561 is an apocalyptic number.

It is an amenable number.

877812082561 is a deficient number, since it is larger than the sum of its proper divisors (1418113839).

877812082561 is a wasteful number, since it uses less digits than its factorization.

877812082561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418113838.

The product of its (nonzero) digits is 3010560, while the sum is 55.

The spelling of 877812082561 in words is "eight hundred seventy-seven billion, eight hundred twelve million, eighty-two thousand, five hundred sixty-one".