15665190641 has 2 divisors, whose sum is σ = 15665190642. Its totient is φ = 15665190640.

The previous prime is 15665190557. The next prime is 15665190677. The reversal of 15665190641 is 14609156651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15330154225 + 335036416 = 123815^2 + 18304^2 .

It is an emirp because it is prime and its reverse (14609156651) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15665190641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15665190592 and 15665190601.

It is not a weakly prime, because it can be changed into another prime (15665190941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7832595320 + 7832595321.

It is an arithmetic number, because the mean of its divisors is an integer number (7832595321).

Almost surely, 2^15665190641 is an apocalyptic number.

It is an amenable number.

15665190641 is a deficient number, since it is larger than the sum of its proper divisors (1).

15665190641 is an equidigital number, since it uses as much as digits as its factorization.

15665190641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 15665190641 in words is "fifteen billion, six hundred sixty-five million, one hundred ninety thousand, six hundred forty-one".