129540663 has 72 divisors (see below), whose sum is σ = 237202992. Its totient is φ = 67640832.

The previous prime is 129540659. The next prime is 129540701. The reversal of 129540663 is 366045921.

It is a happy number.

It is not a de Polignac number, because 129540663 - 2² = 129540659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129540643) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 277156 + ... + 277622.

It is an arithmetic number, because the mean of its divisors is an integer number (3294486).

Almost surely, 2^129540663 is an apocalyptic number.

129540663 is a deficient number, since it is larger than the sum of its proper divisors (107662329).

129540663 is a wasteful number, since it uses less digits than its factorization.

129540663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 129540663 is about 11381.5931661609. The cubic root of 129540663 is about 505.9823547305.

The spelling of 129540663 in words is "one hundred twenty-nine million, five hundred forty thousand, six hundred sixty-three".