66156929 has 2 divisors, whose sum is σ = 66156930. Its totient is φ = 66156928.

The previous prime is 66156913. The next prime is 66156941. The reversal of 66156929 is 92965166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42876304 + 23280625 = 6548^2 + 4825^2 .

It is a cyclic number.

It is not a de Polignac number, because 66156929 - 2⁴ = 66156913 is a prime.

It is a super-2 number, since 2×66156929² = 8753478509422082, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66156929.

It is not a weakly prime, because it can be changed into another prime (66156989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33078464 + 33078465.

It is an arithmetic number, because the mean of its divisors is an integer number (33078465).

Almost surely, 2^66156929 is an apocalyptic number.

It is an amenable number.

66156929 is a deficient number, since it is larger than the sum of its proper divisors (1).

66156929 is an equidigital number, since it uses as much as digits as its factorization.

66156929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 44.

The square root of 66156929 is about 8133.6909825737. The cubic root of 66156929 is about 404.4440453852. Note that the first 3 decimals are identical.

The spelling of 66156929 in words is "sixty-six million, one hundred fifty-six thousand, nine hundred twenty-nine".