261553311030674 has 8 divisors (see below), whose sum is σ = 422509194741900. Its totient is φ = 120716912783376.

The previous prime is 261553311030643. The next prime is 261553311030709. The reversal of 261553311030674 is 476030113355162.

It can be written as a sum of positive squares in 2 ways, for example, as 223281085563649 + 38272225467025 = 14942593^2 + 6186455^2 .

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

It is a super-2 number, since 2×261553311030674² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 5029871365949 + ... + 5029871366000.

Almost surely, 2^{261553311030674} is an apocalyptic number.

261553311030674 is a deficient number, since it is larger than the sum of its proper divisors (160955883711226).

261553311030674 is a wasteful number, since it uses less digits than its factorization.

261553311030674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10059742731964.

The product of its (nonzero) digits is 1360800, while the sum is 47.

The spelling of 261553311030674 in words is "two hundred sixty-one trillion, five hundred fifty-three billion, three hundred eleven million, thirty thousand, six hundred seventy-four".