261242893758 has 64 divisors (see below), whose sum is σ = 651514728960. Its totient is φ = 67844476800.

The previous prime is 261242893733. The next prime is 261242893771. The reversal of 261242893758 is 857398242162.

It is a junction number, because it is equal to n+sod(n) for n = 261242893698 and 261242893707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3091128 + ... + 3174516.

It is an arithmetic number, because the mean of its divisors is an integer number (10179917640).

Almost surely, 2^261242893758 is an apocalyptic number.

261242893758 is an abundant number, since it is smaller than the sum of its proper divisors (390271835202).

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

261242893758 is a wasteful number, since it uses less digits than its factorization.

261242893758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90193.

The product of its digits is 11612160, while the sum is 57.

The spelling of 261242893758 in words is "two hundred sixty-one billion, two hundred forty-two million, eight hundred ninety-three thousand, seven hundred fifty-eight".