261553776257674 has 8 divisors (see below), whose sum is σ = 392337809918208. Its totient is φ = 130774506284940.

The previous prime is 261553776257623. The next prime is 261553776257687. The reversal of 261553776257674 is 476752677355162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 261553776257597 and 261553776257606.

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, 1190784682 + ... + 1191004309.

It is an arithmetic number, because the mean of its divisors is an integer number (49042226239776).

Almost surely, 2^{261553776257674} is an apocalyptic number.

261553776257674 is a deficient number, since it is larger than the sum of its proper divisors (130784033660534).

261553776257674 is a wasteful number, since it uses less digits than its factorization.

261553776257674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381843900.

The product of its digits is 3111696000, while the sum is 73.

The spelling of 261553776257674 in words is "two hundred sixty-one trillion, five hundred fifty-three billion, seven hundred seventy-six million, two hundred fifty-seven thousand, six hundred seventy-four".