261442170075450 has 192 divisors, whose sum is σ = 803826784293120. Its totient is φ = 54758786365440.

The previous prime is 261442170075439. The next prime is 261442170075473. The reversal of 261442170075450 is 54570071244162.

It is a self number, because there is not a number n which added to its sum of digits gives 261442170075450.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 68032405 + ... + 71772504.

It is an arithmetic number, because the mean of its divisors is an integer number (4186597834860).

Almost surely, 2^{261442170075450} is an apocalyptic number.

261442170075450 is an abundant number, since it is smaller than the sum of its proper divisors (542384614217670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261442170075450 is a wasteful number, since it uses less digits than its factorization.

261442170075450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139805081 (or 139805076 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 48.

The spelling of 261442170075450 in words is "two hundred sixty-one trillion, four hundred forty-two billion, one hundred seventy million, seventy-five thousand, four hundred fifty".