261572555046242 has 32 divisors (see below), whose sum is σ = 448664439351744. Its totient is φ = 113299100812800.

The previous prime is 261572555046233. The next prime is 261572555046251. The reversal of 261572555046242 is 242640555275162.

It is an interprime number because it is at equal distance from previous prime (261572555046233) and next prime (261572555046251).

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 15 ways as a sum of consecutive naturals, for example, 3371958263 + ... + 3372035834.

It is an arithmetic number, because the mean of its divisors is an integer number (14020763729742).

Almost surely, 2^{261572555046242} is an apocalyptic number.

261572555046242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261572555046242 is a deficient number, since it is larger than the sum of its proper divisors (187091884305502).

261572555046242 is a wasteful number, since it uses less digits than its factorization.

261572555046242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6743994194.

The product of its (nonzero) digits is 40320000, while the sum is 56.

The spelling of 261572555046242 in words is "two hundred sixty-one trillion, five hundred seventy-two billion, five hundred fifty-five million, forty-six thousand, two hundred forty-two".