661910146 has 16 divisors (see below), whose sum is σ = 1053021888. Its totient is φ = 311374800.

The previous prime is 661910141. The next prime is 661910159. The reversal of 661910146 is 641019166.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (661910141) 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, 115140 + ... + 120751.

It is an arithmetic number, because the mean of its divisors is an integer number (65813868).

Almost surely, 2^661910146 is an apocalyptic number.

661910146 is a deficient number, since it is larger than the sum of its proper divisors (391111742).

661910146 is a wasteful number, since it uses less digits than its factorization.

661910146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235977.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 661910146 is about 25727.6144638402. The cubic root of 661910146 is about 871.4979022122.

The spelling of 661910146 in words is "six hundred sixty-one million, nine hundred ten thousand, one hundred forty-six".