261160166587 has 2 divisors, whose sum is σ = 261160166588. Its totient is φ = 261160166586.

The previous prime is 261160166581. The next prime is 261160166591. The reversal of 261160166587 is 785661061162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261160166587 - 2⁷ = 261160166459 is a prime.

It is a super-2 number, since 2×261160166587² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261160166587.

It is not a weakly prime, because it can be changed into another prime (261160166581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130580083293 + 130580083294.

It is an arithmetic number, because the mean of its divisors is an integer number (130580083294).

Almost surely, 2^261160166587 is an apocalyptic number.

261160166587 is a deficient number, since it is larger than the sum of its proper divisors (1).

261160166587 is an equidigital number, since it uses as much as digits as its factorization.

261160166587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 261160166587 in words is "two hundred sixty-one billion, one hundred sixty million, one hundred sixty-six thousand, five hundred eighty-seven".