261656345251434 has 16 divisors (see below), whose sum is σ = 598071646289088. Its totient is φ = 74758955786112.

The previous prime is 261656345251381. The next prime is 261656345251447. The reversal of 261656345251434 is 434152543656162.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3114956491047 + ... + 3114956491130.

It is an arithmetic number, because the mean of its divisors is an integer number (37379477893068).

Almost surely, 2^{261656345251434} is an apocalyptic number.

261656345251434 is an abundant number, since it is smaller than the sum of its proper divisors (336415301037654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261656345251434 is a wasteful number, since it uses less digits than its factorization.

261656345251434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6229912982189.

The product of its digits is 62208000, while the sum is 57.

The spelling of 261656345251434 in words is "two hundred sixty-one trillion, six hundred fifty-six billion, three hundred forty-five million, two hundred fifty-one thousand, four hundred thirty-four".