15534364661 has 2 divisors, whose sum is σ = 15534364662. Its totient is φ = 15534364660.

The previous prime is 15534364621. The next prime is 15534364667. The reversal of 15534364661 is 16646343551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15417940561 + 116424100 = 124169^2 + 10790^2 .

It is a cyclic number.

It is not a de Polignac number, because 15534364661 - 2³⁰ = 14460622837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15534364667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7767182330 + 7767182331.

It is an arithmetic number, because the mean of its divisors is an integer number (7767182331).

Almost surely, 2^15534364661 is an apocalyptic number.

It is an amenable number.

15534364661 is a deficient number, since it is larger than the sum of its proper divisors (1).

15534364661 is an equidigital number, since it uses as much as digits as its factorization.

15534364661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 44.

The spelling of 15534364661 in words is "fifteen billion, five hundred thirty-four million, three hundred sixty-four thousand, six hundred sixty-one".