261551501059 has 2 divisors, whose sum is σ = 261551501060. Its totient is φ = 261551501058.

The previous prime is 261551501047. The next prime is 261551501069. The reversal of 261551501059 is 950105155162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261551501059 - 2⁹ = 261551500547 is a prime.

It is not a weakly prime, because it can be changed into another prime (261551501069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130775750529 + 130775750530.

It is an arithmetic number, because the mean of its divisors is an integer number (130775750530).

Almost surely, 2^261551501059 is an apocalyptic number.

261551501059 is a deficient number, since it is larger than the sum of its proper divisors (1).

261551501059 is an equidigital number, since it uses as much as digits as its factorization.

261551501059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67500, while the sum is 40.

The spelling of 261551501059 in words is "two hundred sixty-one billion, five hundred fifty-one million, five hundred one thousand, fifty-nine".