261576077574547 has 4 divisors (see below), whose sum is σ = 268645701292816. Its totient is φ = 254506453856280.

The previous prime is 261576077574509. The next prime is 261576077574583. The reversal of 261576077574547 is 745475770675162.

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-261576077574547 is a prime.

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 261576077574547.

It is not an unprimeable number, because it can be changed into a prime (261576077574947) 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, 3534811859079 + ... + 3534811859152.

It is an arithmetic number, because the mean of its divisors is an integer number (67161425323204).

Almost surely, 2^{261576077574547} is an apocalyptic number.

261576077574547 is a deficient number, since it is larger than the sum of its proper divisors (7069623718269).

261576077574547 is an equidigital number, since it uses as much as digits as its factorization.

261576077574547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7069623718268.

The product of its (nonzero) digits is 2420208000, while the sum is 73.

The spelling of 261576077574547 in words is "two hundred sixty-one trillion, five hundred seventy-six billion, seventy-seven million, five hundred seventy-four thousand, five hundred forty-seven".