157066661 has 2 divisors, whose sum is σ = 157066662. Its totient is φ = 157066660.

The previous prime is 157066633. The next prime is 157066667. The reversal of 157066661 is 166660751.

157066661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118701025 + 38365636 = 10895^2 + 6194^2 .

It is an emirp because it is prime and its reverse (166660751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157066661 - 2¹⁴ = 157050277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157066667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78533330 + 78533331.

It is an arithmetic number, because the mean of its divisors is an integer number (78533331).

Almost surely, 2^157066661 is an apocalyptic number.

It is an amenable number.

157066661 is a deficient number, since it is larger than the sum of its proper divisors (1).

157066661 is an equidigital number, since it uses as much as digits as its factorization.

157066661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 157066661 is about 12532.6238673312. The cubic root of 157066661 is about 539.5454118889.

The spelling of 157066661 in words is "one hundred fifty-seven million, sixty-six thousand, six hundred sixty-one".