261316154250 has 96 divisors (see below), whose sum is σ = 706743528192. Its totient is φ = 69670044000.

The previous prime is 261316154237. The next prime is 261316154311. The reversal of 261316154250 is 52451613162.

261316154250 is a `hidden beast` number, since 2 + 6 + 1 + 3 + 1 + 61 + 542 + 50 = 666.

261316154250 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×261316154250² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15451299 + ... + 15468201.

It is an arithmetic number, because the mean of its divisors is an integer number (7361911752).

Almost surely, 2^261316154250 is an apocalyptic number.

261316154250 is an abundant number, since it is smaller than the sum of its proper divisors (445427373942).

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

261316154250 is a wasteful number, since it uses less digits than its factorization.

261316154250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23797 (or 23784 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 261316154250 in words is "two hundred sixty-one billion, three hundred sixteen million, one hundred fifty-four thousand, two hundred fifty".