261656276557652 has 12 divisors (see below), whose sum is σ = 457949355995796. Its totient is φ = 130813603416000.

The previous prime is 261656276557649. The next prime is 261656276557787. The reversal of 261656276557652 is 256755672656162.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 86445626092996 + 175210650464656 = 9297614^2 + 13236716^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3633675203 + ... + 3633747210.

It is an arithmetic number, because the mean of its divisors is an integer number (38162446332983).

Almost surely, 2^{261656276557652} is an apocalyptic number.

It is an amenable number.

261656276557652 is a deficient number, since it is larger than the sum of its proper divisors (196293079438144).

261656276557652 is a wasteful number, since it uses less digits than its factorization.

261656276557652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7267431418 (or 7267431416 counting only the distinct ones).

The product of its digits is 1905120000, while the sum is 71.

The spelling of 261656276557652 in words is "two hundred sixty-one trillion, six hundred fifty-six billion, two hundred seventy-six million, five hundred fifty-seven thousand, six hundred fifty-two".