252117651661 has 2 divisors, whose sum is σ = 252117651662. Its totient is φ = 252117651660.

The previous prime is 252117651647. The next prime is 252117651703. The reversal of 252117651661 is 166156711252.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145766658436 + 106350993225 = 381794^2 + 326115^2 .

It is a cyclic number.

It is not a de Polignac number, because 252117651661 - 2¹³ = 252117643469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252117651761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126058825830 + 126058825831.

It is an arithmetic number, because the mean of its divisors is an integer number (126058825831).

Almost surely, 2^252117651661 is an apocalyptic number.

It is an amenable number.

252117651661 is a deficient number, since it is larger than the sum of its proper divisors (1).

252117651661 is an equidigital number, since it uses as much as digits as its factorization.

252117651661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 43.

The spelling of 252117651661 in words is "two hundred fifty-two billion, one hundred seventeen million, six hundred fifty-one thousand, six hundred sixty-one".