15210420157 has 2 divisors, whose sum is σ = 15210420158. Its totient is φ = 15210420156.

The previous prime is 15210420101. The next prime is 15210420179. The reversal of 15210420157 is 75102401251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13533599556 + 1676820601 = 116334^2 + 40949^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15210420157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15210423157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7605210078 + 7605210079.

It is an arithmetic number, because the mean of its divisors is an integer number (7605210079).

Almost surely, 2^15210420157 is an apocalyptic number.

It is an amenable number.

15210420157 is a deficient number, since it is larger than the sum of its proper divisors (1).

15210420157 is an equidigital number, since it uses as much as digits as its factorization.

15210420157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 28.

The spelling of 15210420157 in words is "fifteen billion, two hundred ten million, four hundred twenty thousand, one hundred fifty-seven".