15420423797 has 2 divisors, whose sum is σ = 15420423798. Its totient is φ = 15420423796.

The previous prime is 15420423787. The next prime is 15420423827. The reversal of 15420423797 is 79732402451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9831515716 + 5588908081 = 99154^2 + 74759^2 .

It is a cyclic number.

It is not a de Polignac number, because 15420423797 - 2³² = 11125456501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15420423737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7710211898 + 7710211899.

It is an arithmetic number, because the mean of its divisors is an integer number (7710211899).

Almost surely, 2^15420423797 is an apocalyptic number.

It is an amenable number.

15420423797 is a deficient number, since it is larger than the sum of its proper divisors (1).

15420423797 is an equidigital number, since it uses as much as digits as its factorization.

15420423797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 15420423797 in words is "fifteen billion, four hundred twenty million, four hundred twenty-three thousand, seven hundred ninety-seven".