20157274395397 has 2 divisors, whose sum is σ = 20157274395398. Its totient is φ = 20157274395396.

The previous prime is 20157274395359. The next prime is 20157274395413. The reversal of 20157274395397 is 79359347275102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20102256470916 + 55017924481 = 4483554^2 + 234559^2 .

It is a cyclic number.

It is not a de Polignac number, because 20157274395397 - 2¹¹ = 20157274393349 is a prime.

It is a super-2 number, since 2×20157274395397² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20157274315397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10078637197698 + 10078637197699.

It is an arithmetic number, because the mean of its divisors is an integer number (10078637197699).

Almost surely, 2^{20157274395397} is an apocalyptic number.

It is an amenable number.

20157274395397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20157274395397 is an equidigital number, since it uses as much as digits as its factorization.

20157274395397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100018800, while the sum is 64.

The spelling of 20157274395397 in words is "twenty trillion, one hundred fifty-seven billion, two hundred seventy-four million, three hundred ninety-five thousand, three hundred ninety-seven".