2661881587 has 2 divisors, whose sum is σ = 2661881588. Its totient is φ = 2661881586.

The previous prime is 2661881567. The next prime is 2661881591. The reversal of 2661881587 is 7851881662.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2661881587 is a prime.

It is a super-2 number, since 2×2661881587² = 14171227166419277138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2661881507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330940793 + 1330940794.

It is an arithmetic number, because the mean of its divisors is an integer number (1330940794).

Almost surely, 2^2661881587 is an apocalyptic number.

2661881587 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661881587 is an equidigital number, since it uses as much as digits as its factorization.

2661881587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 52.

The square root of 2661881587 is about 51593.4258118222. The cubic root of 2661881587 is about 1385.8926048508.

The spelling of 2661881587 in words is "two billion, six hundred sixty-one million, eight hundred eighty-one thousand, five hundred eighty-seven".