157321432661 has 2 divisors, whose sum is σ = 157321432662. Its totient is φ = 157321432660.

The previous prime is 157321432627. The next prime is 157321432703. The reversal of 157321432661 is 166234123751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157109176900 + 212255761 = 396370^2 + 14569^2 .

It is a cyclic number.

It is not a de Polignac number, because 157321432661 - 2²² = 157317238357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157321432061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78660716330 + 78660716331.

It is an arithmetic number, because the mean of its divisors is an integer number (78660716331).

Almost surely, 2^157321432661 is an apocalyptic number.

It is an amenable number.

157321432661 is a deficient number, since it is larger than the sum of its proper divisors (1).

157321432661 is an equidigital number, since it uses as much as digits as its factorization.

157321432661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 41.

The spelling of 157321432661 in words is "one hundred fifty-seven billion, three hundred twenty-one million, four hundred thirty-two thousand, six hundred sixty-one".