661004907 has 8 divisors (see below), whose sum is σ = 896278080. Its totient is φ = 433200840.

The previous prime is 661004891. The next prime is 661004921. The reversal of 661004907 is 709400166.

It is a happy number.

661004907 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 661004907 - 2⁴ = 661004891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661004977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1867069 + ... + 1867422.

It is an arithmetic number, because the mean of its divisors is an integer number (112034760).

Almost surely, 2^661004907 is an apocalyptic number.

661004907 is a deficient number, since it is larger than the sum of its proper divisors (235273173).

661004907 is a wasteful number, since it uses less digits than its factorization.

661004907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3734553.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 661004907 is about 25710.0156942776. The cubic root of 661004907 is about 871.1004294276.

The spelling of 661004907 in words is "six hundred sixty-one million, four thousand, nine hundred seven".