261662627 has 2 divisors, whose sum is σ = 261662628. Its totient is φ = 261662626.

The previous prime is 261662603. The next prime is 261662629. The reversal of 261662627 is 726266162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261662627 - 2⁸ = 261662371 is a prime.

It is a super-2 number, since 2×261662627² = 136934660737082258, which contains 22 as substring.

Together with 261662629, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261662629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130831313 + 130831314.

It is an arithmetic number, because the mean of its divisors is an integer number (130831314).

Almost surely, 2^261662627 is an apocalyptic number.

261662627 is a deficient number, since it is larger than the sum of its proper divisors (1).

261662627 is an equidigital number, since it uses as much as digits as its factorization.

261662627 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 38.

The square root of 261662627 is about 16175.9892124099. The cubic root of 261662627 is about 639.6080176203.

The spelling of 261662627 in words is "two hundred sixty-one million, six hundred sixty-two thousand, six hundred twenty-seven".