265882885661 has 4 divisors (see below), whose sum is σ = 268322178300. Its totient is φ = 263443593024.

The previous prime is 265882885657. The next prime is 265882885679. The reversal of 265882885661 is 166588288562.

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

It can be written as a sum of positive squares in 2 ways, for example, as 118287844900 + 147595040761 = 343930^2 + 384181^2 .

It is a cyclic number.

It is not a de Polignac number, because 265882885661 - 2² = 265882885657 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 (265882887661) 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, 1219646156 + ... + 1219646373.

It is an arithmetic number, because the mean of its divisors is an integer number (67080544575).

Almost surely, 2^265882885661 is an apocalyptic number.

It is an amenable number.

265882885661 is a deficient number, since it is larger than the sum of its proper divisors (2439292639).

265882885661 is a wasteful number, since it uses less digits than its factorization.

265882885661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2439292638.

The product of its digits is 88473600, while the sum is 65.

The spelling of 265882885661 in words is "two hundred sixty-five billion, eight hundred eighty-two million, eight hundred eighty-five thousand, six hundred sixty-one".