253366126661 has 12 divisors (see below), whose sum is σ = 260530875108. Its totient is φ = 246393487872.

The previous prime is 253366126639. The next prime is 253366126667. The reversal of 253366126661 is 166621663352.

It can be written as a sum of positive squares in 6 ways, for example, as 161901616900 + 91464509761 = 402370^2 + 302431^2 .

It is a de Polignac number, because none of the positive numbers 2^k-253366126661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253366126667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2715395 + ... + 2807151.

It is an arithmetic number, because the mean of its divisors is an integer number (21710906259).

Almost surely, 2^253366126661 is an apocalyptic number.

It is an amenable number.

253366126661 is a deficient number, since it is larger than the sum of its proper divisors (7164748447).

253366126661 is an equidigital number, since it uses as much as digits as its factorization.

253366126661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93848 (or 93811 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 47.

The spelling of 253366126661 in words is "two hundred fifty-three billion, three hundred sixty-six million, one hundred twenty-six thousand, six hundred sixty-one".