129649066 has 4 divisors (see below), whose sum is σ = 194473602. Its totient is φ = 64824532.

The previous prime is 129649063. The next prime is 129649127. The reversal of 129649066 is 660946921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 660946921 = 157 ⋅4209853.

It can be written as a sum of positive squares in only one way, i.e., 123543225 + 6105841 = 11115^2 + 2471^2 .

It is not an unprimeable number, because it can be changed into a prime (129649061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32412265 + ... + 32412268.

Almost surely, 2^129649066 is an apocalyptic number.

129649066 is a deficient number, since it is larger than the sum of its proper divisors (64824536).

129649066 is an equidigital number, since it uses as much as digits as its factorization.

129649066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64824535.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 129649066 is about 11386.3543770603. The cubic root of 129649066 is about 506.1234551157.

The spelling of 129649066 in words is "one hundred twenty-nine million, six hundred forty-nine thousand, sixty-six".