15745960621 has 2 divisors, whose sum is σ = 15745960622. Its totient is φ = 15745960620.

The previous prime is 15745960597. The next prime is 15745960631. The reversal of 15745960621 is 12606954751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15149917225 + 596043396 = 123085^2 + 24414^2 .

It is an emirp because it is prime and its reverse (12606954751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15745960621 - 2¹¹ = 15745958573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15745960631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7872980310 + 7872980311.

It is an arithmetic number, because the mean of its divisors is an integer number (7872980311).

Almost surely, 2^15745960621 is an apocalyptic number.

It is an amenable number.

15745960621 is a deficient number, since it is larger than the sum of its proper divisors (1).

15745960621 is an equidigital number, since it uses as much as digits as its factorization.

15745960621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 15745960621 in words is "fifteen billion, seven hundred forty-five million, nine hundred sixty thousand, six hundred twenty-one".