15945145973 has 2 divisors, whose sum is σ = 15945145974. Its totient is φ = 15945145972.

The previous prime is 15945145907. The next prime is 15945146017. The reversal of 15945145973 is 37954154951.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14226048529 + 1719097444 = 119273^2 + 41462^2 .

It is a cyclic number.

It is not a de Polignac number, because 15945145973 - 2⁸ = 15945145717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15945145273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7972572986 + 7972572987.

It is an arithmetic number, because the mean of its divisors is an integer number (7972572987).

Almost surely, 2^15945145973 is an apocalyptic number.

It is an amenable number.

15945145973 is a deficient number, since it is larger than the sum of its proper divisors (1).

15945145973 is an equidigital number, since it uses as much as digits as its factorization.

15945145973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402000, while the sum is 53.

The spelling of 15945145973 in words is "fifteen billion, nine hundred forty-five million, one hundred forty-five thousand, nine hundred seventy-three".