15420456497 has 2 divisors, whose sum is σ = 15420456498. Its totient is φ = 15420456496.

The previous prime is 15420456439. The next prime is 15420456503. The reversal of 15420456497 is 79465402451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9638526976 + 5781929521 = 98176^2 + 76039^2 .

It is a cyclic number.

It is not a de Polignac number, because 15420456497 - 2¹⁰ = 15420455473 is a prime.

It is a super-2 number, since 2×15420456497² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15420456427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7710228248 + 7710228249.

It is an arithmetic number, because the mean of its divisors is an integer number (7710228249).

Almost surely, 2^15420456497 is an apocalyptic number.

It is an amenable number.

15420456497 is a deficient number, since it is larger than the sum of its proper divisors (1).

15420456497 is an equidigital number, since it uses as much as digits as its factorization.

15420456497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 15420456497 in words is "fifteen billion, four hundred twenty million, four hundred fifty-six thousand, four hundred ninety-seven".