261394727902 has 32 divisors (see below), whose sum is σ = 514570625280. Its totient is φ = 96481990080.

The previous prime is 261394727879. The next prime is 261394727963. The reversal of 261394727902 is 209727493162.

It is a self number, because there is not a number n which added to its sum of digits gives 261394727902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44664663 + ... + 44670514.

It is an arithmetic number, because the mean of its divisors is an integer number (16080332040).

Almost surely, 2^261394727902 is an apocalyptic number.

261394727902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261394727902 is a deficient number, since it is larger than the sum of its proper divisors (253175897378).

261394727902 is a wasteful number, since it uses less digits than its factorization.

261394727902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89335216.

The product of its (nonzero) digits is 2286144, while the sum is 52.

The spelling of 261394727902 in words is "two hundred sixty-one billion, three hundred ninety-four million, seven hundred twenty-seven thousand, nine hundred two".