15660231553 has 2 divisors, whose sum is σ = 15660231554. Its totient is φ = 15660231552.

The previous prime is 15660231427. The next prime is 15660231563. The reversal of 15660231553 is 35513206651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7879580289 + 7780651264 = 88767^2 + 88208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15660231553 is a prime.

It is not a weakly prime, because it can be changed into another prime (15660231563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7830115776 + 7830115777.

It is an arithmetic number, because the mean of its divisors is an integer number (7830115777).

Almost surely, 2^15660231553 is an apocalyptic number.

It is an amenable number.

15660231553 is a deficient number, since it is larger than the sum of its proper divisors (1).

15660231553 is an equidigital number, since it uses as much as digits as its factorization.

15660231553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 37.

The spelling of 15660231553 in words is "fifteen billion, six hundred sixty million, two hundred thirty-one thousand, five hundred fifty-three".