15250513661 has 2 divisors, whose sum is σ = 15250513662. Its totient is φ = 15250513660.

The previous prime is 15250513631. The next prime is 15250513667. The reversal of 15250513661 is 16631505251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7756148761 + 7494364900 = 88069^2 + 86570^2 .

It is a cyclic number.

It is not a de Polignac number, because 15250513661 - 2¹⁸ = 15250251517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15250513667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7625256830 + 7625256831.

It is an arithmetic number, because the mean of its divisors is an integer number (7625256831).

Almost surely, 2^15250513661 is an apocalyptic number.

It is an amenable number.

15250513661 is a deficient number, since it is larger than the sum of its proper divisors (1).

15250513661 is an equidigital number, since it uses as much as digits as its factorization.

15250513661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 15250513661 in words is "fifteen billion, two hundred fifty million, five hundred thirteen thousand, six hundred sixty-one".