661161129 has 8 divisors (see below), whose sum is σ = 883462272. Its totient is φ = 439817040.

The previous prime is 661161119. The next prime is 661161131. The reversal of 661161129 is 921161166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661161129 - 2⁴ = 661161113 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 661161129.

It is not an unprimeable number, because it can be changed into a prime (661161119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237649 + ... + 240414.

It is an arithmetic number, because the mean of its divisors is an integer number (110432784).

Almost surely, 2^661161129 is an apocalyptic number.

It is an amenable number.

661161129 is a deficient number, since it is larger than the sum of its proper divisors (222301143).

661161129 is a wasteful number, since it uses less digits than its factorization.

661161129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478527.

The product of its digits is 3888, while the sum is 33.

The square root of 661161129 is about 25713.0536692941. The cubic root of 661161129 is about 871.1690493579.

The spelling of 661161129 in words is "six hundred sixty-one million, one hundred sixty-one thousand, one hundred twenty-nine".