156740994181 has 2 divisors, whose sum is σ = 156740994182. Its totient is φ = 156740994180.

The previous prime is 156740994173. The next prime is 156740994191. The reversal of 156740994181 is 181499047651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142000848900 + 14740145281 = 376830^2 + 121409^2 .

It is a cyclic number.

It is not a de Polignac number, because 156740994181 - 2³ = 156740994173 is a prime.

It is a super-2 number, since 2×156740994181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156740994191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78370497090 + 78370497091.

It is an arithmetic number, because the mean of its divisors is an integer number (78370497091).

Almost surely, 2^156740994181 is an apocalyptic number.

It is an amenable number.

156740994181 is a deficient number, since it is larger than the sum of its proper divisors (1).

156740994181 is an equidigital number, since it uses as much as digits as its factorization.

156740994181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 156740994181 in words is "one hundred fifty-six billion, seven hundred forty million, nine hundred ninety-four thousand, one hundred eighty-one".