261657118474 has 4 divisors (see below), whose sum is σ = 392485677714. Its totient is φ = 130828559236.

The previous prime is 261657118433. The next prime is 261657118477. The reversal of 261657118474 is 474811756162.

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

It can be written as a sum of positive squares in only one way, i.e., 133668478449 + 127988640025 = 365607^2 + 357755^2 .

It is not an unprimeable number, because it can be changed into a prime (261657118477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65414279617 + ... + 65414279620.

Almost surely, 2^261657118474 is an apocalyptic number.

261657118474 is a deficient number, since it is larger than the sum of its proper divisors (130828559240).

261657118474 is a wasteful number, since it uses less digits than its factorization.

261657118474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130828559239.

The product of its digits is 2257920, while the sum is 52.

The spelling of 261657118474 in words is "two hundred sixty-one billion, six hundred fifty-seven million, one hundred eighteen thousand, four hundred seventy-four".