261655511254426 has 8 divisors (see below), whose sum is σ = 405144017426304. Its totient is φ = 126607505445660.

The previous prime is 261655511254393. The next prime is 261655511254453. The reversal of 261655511254426 is 624452115556162.

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

It is a super-2 number, since 2×261655511254426² (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 (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2110125090700 + ... + 2110125090823.

It is an arithmetic number, because the mean of its divisors is an integer number (50643002178288).

Almost surely, 2^{261655511254426} is an apocalyptic number.

261655511254426 is a deficient number, since it is larger than the sum of its proper divisors (143488506171878).

261655511254426 is a wasteful number, since it uses less digits than its factorization.

261655511254426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4220250181556.

The product of its digits is 17280000, while the sum is 55.

The spelling of 261655511254426 in words is "two hundred sixty-one trillion, six hundred fifty-five billion, five hundred eleven million, two hundred fifty-four thousand, four hundred twenty-six".