15456220397 has 2 divisors, whose sum is σ = 15456220398. Its totient is φ = 15456220396.

The previous prime is 15456220387. The next prime is 15456220447. The reversal of 15456220397 is 79302265451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13985191081 + 1471029316 = 118259^2 + 38354^2 .

It is an emirp because it is prime and its reverse (79302265451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15456220397 - 2⁸ = 15456220141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15456220337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7728110198 + 7728110199.

It is an arithmetic number, because the mean of its divisors is an integer number (7728110199).

Almost surely, 2^15456220397 is an apocalyptic number.

It is an amenable number.

15456220397 is a deficient number, since it is larger than the sum of its proper divisors (1).

15456220397 is an equidigital number, since it uses as much as digits as its factorization.

15456220397 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 44.

The spelling of 15456220397 in words is "fifteen billion, four hundred fifty-six million, two hundred twenty thousand, three hundred ninety-seven".