12154207657 has 2 divisors, whose sum is σ = 12154207658. Its totient is φ = 12154207656.

The previous prime is 12154207651. The next prime is 12154207697. The reversal of 12154207657 is 75670245121.

It is an a-pointer prime, because the next prime (12154207697) can be obtained adding 12154207657 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10561878441 + 1592329216 = 102771^2 + 39904^2 .

It is a cyclic number.

It is not a de Polignac number, because 12154207657 - 2¹⁵ = 12154174889 is a prime.

It is not a weakly prime, because it can be changed into another prime (12154207651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077103828 + 6077103829.

It is an arithmetic number, because the mean of its divisors is an integer number (6077103829).

Almost surely, 2^12154207657 is an apocalyptic number.

It is an amenable number.

12154207657 is a deficient number, since it is larger than the sum of its proper divisors (1).

12154207657 is an equidigital number, since it uses as much as digits as its factorization.

12154207657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 12154207657 in words is "twelve billion, one hundred fifty-four million, two hundred seven thousand, six hundred fifty-seven".