15535532497 has 2 divisors, whose sum is σ = 15535532498. Its totient is φ = 15535532496.

The previous prime is 15535532461. The next prime is 15535532503. The reversal of 15535532497 is 79423553551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12617804241 + 2917728256 = 112329^2 + 54016^2 .

It is a cyclic number.

It is not a de Polignac number, because 15535532497 - 2²⁷ = 15401314769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15535532497.

It is not a weakly prime, because it can be changed into another prime (15535532407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7767766248 + 7767766249.

It is an arithmetic number, because the mean of its divisors is an integer number (7767766249).

Almost surely, 2^15535532497 is an apocalyptic number.

It is an amenable number.

15535532497 is a deficient number, since it is larger than the sum of its proper divisors (1).

15535532497 is an equidigital number, since it uses as much as digits as its factorization.

15535532497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2835000, while the sum is 49.

The spelling of 15535532497 in words is "fifteen billion, five hundred thirty-five million, five hundred thirty-two thousand, four hundred ninety-seven".