261552510112567 has 4 divisors (see below), whose sum is σ = 261553605496920. Its totient is φ = 261551414728216.

The previous prime is 261552510112547. The next prime is 261552510112657. The reversal of 261552510112567 is 765211015255162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261552510112567 is a prime.

It is a super-2 number, since 2×261552510112567² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261552510112567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261552510112547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547333933 + ... + 547811590.

It is an arithmetic number, because the mean of its divisors is an integer number (65388401374230).

Almost surely, 2^{261552510112567} is an apocalyptic number.

261552510112567 is a deficient number, since it is larger than the sum of its proper divisors (1095384353).

261552510112567 is a wasteful number, since it uses less digits than its factorization.

261552510112567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095384352.

The product of its (nonzero) digits is 1260000, while the sum is 49.

The spelling of 261552510112567 in words is "two hundred sixty-one trillion, five hundred fifty-two billion, five hundred ten million, one hundred twelve thousand, five hundred sixty-seven".