2157715172551 has 2 divisors, whose sum is σ = 2157715172552. Its totient is φ = 2157715172550.

The previous prime is 2157715172513. The next prime is 2157715172603. The reversal of 2157715172551 is 1552715177512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2157715172551 - 2⁷ = 2157715172423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2157715172495 and 2157715172504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157715112551) 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, 1078857586275 + 1078857586276.

It is an arithmetic number, because the mean of its divisors is an integer number (1078857586276).

Almost surely, 2^{2157715172551} is an apocalyptic number.

2157715172551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157715172551 is an equidigital number, since it uses as much as digits as its factorization.

2157715172551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857500, while the sum is 49.

The spelling of 2157715172551 in words is "two trillion, one hundred fifty-seven billion, seven hundred fifteen million, one hundred seventy-two thousand, five hundred fifty-one".