15420137542657 has 4 divisors (see below), whose sum is σ = 15470366004016. Its totient is φ = 15369909081300.

The previous prime is 15420137542643. The next prime is 15420137542673. The reversal of 15420137542657 is 75624573102451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15420137542657 - 2¹⁹ = 15420137018369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15420137542627) 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, 25114230219 + ... + 25114230832.

It is an arithmetic number, because the mean of its divisors is an integer number (3867591501004).

Almost surely, 2^{15420137542657} is an apocalyptic number.

It is an amenable number.

15420137542657 is a deficient number, since it is larger than the sum of its proper divisors (50228461359).

15420137542657 is an equidigital number, since it uses as much as digits as its factorization.

15420137542657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50228461358.

The product of its (nonzero) digits is 7056000, while the sum is 52.

The spelling of 15420137542657 in words is "fifteen trillion, four hundred twenty billion, one hundred thirty-seven million, five hundred forty-two thousand, six hundred fifty-seven".