15421452157 has 4 divisors (see below), whose sum is σ = 15422286460. Its totient is φ = 15420617856.

The previous prime is 15421452149. The next prime is 15421452181. The reversal of 15421452157 is 75125412451.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75125412451 = 149 ⋅504197399.

It can be written as a sum of positive squares in 2 ways, for example, as 6453551556 + 8967900601 = 80334^2 + 94699^2 .

It is a cyclic number.

It is not a de Polignac number, because 15421452157 - 2³ = 15421452149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15421452187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388782 + ... + 426607.

It is an arithmetic number, because the mean of its divisors is an integer number (3855571615).

Almost surely, 2^15421452157 is an apocalyptic number.

It is an amenable number.

15421452157 is a deficient number, since it is larger than the sum of its proper divisors (834303).

15421452157 is an equidigital number, since it uses as much as digits as its factorization.

15421452157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834302.

The product of its digits is 56000, while the sum is 37.

The spelling of 15421452157 in words is "fifteen billion, four hundred twenty-one million, four hundred fifty-two thousand, one hundred fifty-seven".