261745729194 has 16 divisors (see below), whose sum is σ = 523504235232. Its totient is φ = 87246446928.

The previous prime is 261745729123. The next prime is 261745729213. The reversal of 261745729194 is 491927547162.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254929 + ... + 767124.

It is an arithmetic number, because the mean of its divisors is an integer number (32719014702).

Almost surely, 2^261745729194 is an apocalyptic number.

261745729194 is an abundant number, since it is smaller than the sum of its proper divisors (261758506038).

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

261745729194 is a wasteful number, since it uses less digits than its factorization.

261745729194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064741.

The product of its digits is 7620480, while the sum is 57.

The spelling of 261745729194 in words is "two hundred sixty-one billion, seven hundred forty-five million, seven hundred twenty-nine thousand, one hundred ninety-four".