2157424246517 has 2 divisors, whose sum is σ = 2157424246518. Its totient is φ = 2157424246516.

The previous prime is 2157424246501. The next prime is 2157424246529. The reversal of 2157424246517 is 7156424247512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1125383627281 + 1032040619236 = 1060841^2 + 1015894^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157424246517 - 2⁴ = 2157424246501 is a prime.

It is a super-3 number, since 3×2157424246517³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157424206517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078712123258 + 1078712123259.

It is an arithmetic number, because the mean of its divisors is an integer number (1078712123259).

Almost surely, 2^{2157424246517} is an apocalyptic number.

It is an amenable number.

2157424246517 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157424246517 is an equidigital number, since it uses as much as digits as its factorization.

2157424246517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3763200, while the sum is 50.

The spelling of 2157424246517 in words is "two trillion, one hundred fifty-seven billion, four hundred twenty-four million, two hundred forty-six thousand, five hundred seventeen".