157011661 has 2 divisors, whose sum is σ = 157011662. Its totient is φ = 157011660.

The previous prime is 157011637. The next prime is 157011667. The reversal of 157011661 is 166110751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117397225 + 39614436 = 10835^2 + 6294^2 .

It is a cyclic number.

It is not a de Polignac number, because 157011661 - 2¹⁷ = 156880589 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157011667) 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, 78505830 + 78505831.

It is an arithmetic number, because the mean of its divisors is an integer number (78505831).

Almost surely, 2^157011661 is an apocalyptic number.

It is an amenable number.

157011661 is a deficient number, since it is larger than the sum of its proper divisors (1).

157011661 is an equidigital number, since it uses as much as digits as its factorization.

157011661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 157011661 is about 12530.4294020596. The cubic root of 157011661 is about 539.4824270349.

It can be divided in two parts, 1570 and 11661, that added together give a palindrome (13231).

The spelling of 157011661 in words is "one hundred fifty-seven million, eleven thousand, six hundred sixty-one".