61666790 has 16 divisors (see below), whose sum is σ = 114000912. Its totient is φ = 23999904.

The previous prime is 61666777. The next prime is 61666811. The reversal of 61666790 is 9766616.

It is a congruent number.

It is an unprimeable number.

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, 82964 + ... + 83703.

It is an arithmetic number, because the mean of its divisors is an integer number (7125057).

Almost surely, 2^61666790 is an apocalyptic number.

61666790 is a deficient number, since it is larger than the sum of its proper divisors (52334122).

61666790 is a wasteful number, since it uses less digits than its factorization.

61666790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166711.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 61666790 is about 7852.8205124019. The cubic root of 61666790 is about 395.0788498254.

The spelling of 61666790 in words is "sixty-one million, six hundred sixty-six thousand, seven hundred ninety".