156663181249 has 9 divisors (see below), whose sum is σ = 163780290723. Its totient is φ = 149843030832.

The previous prime is 156663181247. The next prime is 156663181273. The reversal of 156663181249 is 942181366651.

It is a happy number.

The square root of 156663181249 is 395807.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 71071827649 + 85591353600 = 266593^2 + 292560^2 .

It is not a de Polignac number, because 156663181249 - 2¹ = 156663181247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 156663181196 and 156663181205.

It is not an unprimeable number, because it can be changed into a prime (156663181243) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9094957 + ... + 9112165.

Almost surely, 2^156663181249 is an apocalyptic number.

156663181249 is the 395807-th square number.

156663181249 is the 197904-th centered octagonal number.

It is an amenable number.

156663181249 is a deficient number, since it is larger than the sum of its proper divisors (7117109474).

156663181249 is an frugal number, since it uses more digits than its factorization.

156663181249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34464 (or 17232 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 52.

The spelling of 156663181249 in words is "one hundred fifty-six billion, six hundred sixty-three million, one hundred eighty-one thousand, two hundred forty-nine".