265206261651901 has 2 divisors, whose sum is σ = 265206261651902. Its totient is φ = 265206261651900.

The previous prime is 265206261651869. The next prime is 265206261651917. The reversal of 265206261651901 is 109156162602562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243532441736676 + 21673819915225 = 15605526^2 + 4655515^2 .

It is a cyclic number.

It is not a de Polignac number, because 265206261651901 - 2⁵ = 265206261651869 is a prime.

It is a super-2 number, since 2×265206261651901² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265206261621901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132603130825950 + 132603130825951.

It is an arithmetic number, because the mean of its divisors is an integer number (132603130825951).

Almost surely, 2^{265206261651901} is an apocalyptic number.

It is an amenable number.

265206261651901 is a deficient number, since it is larger than the sum of its proper divisors (1).

265206261651901 is an equidigital number, since it uses as much as digits as its factorization.

265206261651901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 265206261651901 in words is "two hundred sixty-five trillion, two hundred six billion, two hundred sixty-one million, six hundred fifty-one thousand, nine hundred one".