157321761761 has 2 divisors, whose sum is σ = 157321761762. Its totient is φ = 157321761760.

The previous prime is 157321761757. The next prime is 157321761791. The reversal of 157321761761 is 167167123751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117419302225 + 39902459536 = 342665^2 + 199756^2 .

It is a cyclic number.

It is not a de Polignac number, because 157321761761 - 2² = 157321761757 is a prime.

It is a super-2 number, since 2×157321761761² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (157321761791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78660880880 + 78660880881.

It is an arithmetic number, because the mean of its divisors is an integer number (78660880881).

Almost surely, 2^157321761761 is an apocalyptic number.

It is an amenable number.

157321761761 is a deficient number, since it is larger than the sum of its proper divisors (1).

157321761761 is an equidigital number, since it uses as much as digits as its factorization.

157321761761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 370440, while the sum is 47.

The spelling of 157321761761 in words is "one hundred fifty-seven billion, three hundred twenty-one million, seven hundred sixty-one thousand, seven hundred sixty-one".