261790305648 has 80 divisors (see below), whose sum is σ = 718716427776. Its totient is φ = 81827159040.

The previous prime is 261790305611. The next prime is 261790305677. The reversal of 261790305648 is 846503097162.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 261790305648.

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, 370786 + ... + 813057.

It is a 1-persistent number, because it is pandigital, but 2⋅261790305648 = 523580611296 is not.

Almost surely, 2^261790305648 is an apocalyptic number.

It is an amenable number.

261790305648 is an abundant number, since it is smaller than the sum of its proper divisors (456926122128).

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

261790305648 is a wasteful number, since it uses less digits than its factorization.

261790305648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184142 (or 1184136 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 261790305648 in words is "two hundred sixty-one billion, seven hundred ninety million, three hundred five thousand, six hundred forty-eight".