661603276 has 24 divisors (see below), whose sum is σ = 1176263424. Its totient is φ = 325545360.

The previous prime is 661603273. The next prime is 661603301. The reversal of 661603276 is 672306166.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (661603273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180801 + ... + 184423.

It is an arithmetic number, because the mean of its divisors is an integer number (49010976).

Almost surely, 2^661603276 is an apocalyptic number.

It is an amenable number.

661603276 is a deficient number, since it is larger than the sum of its proper divisors (514660148).

661603276 is a wasteful number, since it uses less digits than its factorization.

661603276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4341 (or 4339 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 661603276 is about 25721.6499470777. The cubic root of 661603276 is about 871.3632022067.

The spelling of 661603276 in words is "six hundred sixty-one million, six hundred three thousand, two hundred seventy-six".