157681646897 has 2 divisors, whose sum is σ = 157681646898. Its totient is φ = 157681646896.

The previous prime is 157681646851. The next prime is 157681646911. The reversal of 157681646897 is 798646186751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136191259681 + 21490387216 = 369041^2 + 146596^2 .

It is a cyclic number.

It is not a de Polignac number, because 157681646897 - 2²⁶ = 157614538033 is a prime.

It is not a weakly prime, because it can be changed into another prime (157681646197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78840823448 + 78840823449.

It is an arithmetic number, because the mean of its divisors is an integer number (78840823449).

Almost surely, 2^157681646897 is an apocalyptic number.

It is an amenable number.

157681646897 is a deficient number, since it is larger than the sum of its proper divisors (1).

157681646897 is an equidigital number, since it uses as much as digits as its factorization.

157681646897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 121927680, while the sum is 68.

The spelling of 157681646897 in words is "one hundred fifty-seven billion, six hundred eighty-one million, six hundred forty-six thousand, eight hundred ninety-seven".