261366229274 has 4 divisors (see below), whose sum is σ = 392049343914. Its totient is φ = 130683114636.

The previous prime is 261366229261. The next prime is 261366229301. The reversal of 261366229274 is 472922663162.

It is a happy number.

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., 217628781049 + 43737448225 = 466507^2 + 209135^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65341557317 + ... + 65341557320.

Almost surely, 2^261366229274 is an apocalyptic number.

261366229274 is a deficient number, since it is larger than the sum of its proper divisors (130683114640).

261366229274 is a wasteful number, since it uses less digits than its factorization.

261366229274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130683114639.

The product of its digits is 2612736, while the sum is 50.

The spelling of 261366229274 in words is "two hundred sixty-one billion, three hundred sixty-six million, two hundred twenty-nine thousand, two hundred seventy-four".