261275072511156 has 48 divisors (see below), whose sum is σ = 665237786078208. Its totient is φ = 79153554261600.

The previous prime is 261275072511137. The next prime is 261275072511199. The reversal of 261275072511156 is 651115270572162.

It is a junction number, because it is equal to n+sod(n) for n = 261275072511099 and 261275072511108.

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, 258370150 + ... + 259379421.

It is an arithmetic number, because the mean of its divisors is an integer number (13859120543296).

Almost surely, 2^{261275072511156} is an apocalyptic number.

It is an amenable number.

261275072511156 is an abundant number, since it is smaller than the sum of its proper divisors (403962713567052).

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

261275072511156 is a wasteful number, since it uses less digits than its factorization.

261275072511156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517753412 (or 517753410 counting only the distinct ones).

The product of its (nonzero) digits is 1764000, while the sum is 51.

The spelling of 261275072511156 in words is "two hundred sixty-one trillion, two hundred seventy-five billion, seventy-two million, five hundred eleven thousand, one hundred fifty-six".