15457027897 has 4 divisors (see below), whose sum is σ = 15466357876. Its totient is φ = 15447697920.

The previous prime is 15457027889. The next prime is 15457027933. The reversal of 15457027897 is 79872075451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79872075451 = 7 ⋅11410296493.

It can be written as a sum of positive squares in 2 ways, for example, as 2551159081 + 12905868816 = 50509^2 + 113604^2 .

It is a cyclic number.

It is not a de Polignac number, because 15457027897 - 2³ = 15457027889 is a prime.

It is a super-2 number, since 2×15457027897² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15457027837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4662504 + ... + 4665817.

It is an arithmetic number, because the mean of its divisors is an integer number (3866589469).

Almost surely, 2^15457027897 is an apocalyptic number.

It is an amenable number.

15457027897 is a deficient number, since it is larger than the sum of its proper divisors (9329979).

15457027897 is an equidigital number, since it uses as much as digits as its factorization.

15457027897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9329978.

The product of its (nonzero) digits is 4939200, while the sum is 55.

The spelling of 15457027897 in words is "fifteen billion, four hundred fifty-seven million, twenty-seven thousand, eight hundred ninety-seven".