661166126 has 8 divisors (see below), whose sum is σ = 992322120. Its totient is φ = 330392088.

The previous prime is 661166101. The next prime is 661166141. The reversal of 661166126 is 621661166.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91121 + ... + 98108.

It is an arithmetic number, because the mean of its divisors is an integer number (124040265).

Almost surely, 2^661166126 is an apocalyptic number.

661166126 is a deficient number, since it is larger than the sum of its proper divisors (331155994).

661166126 is a wasteful number, since it uses less digits than its factorization.

661166126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190978.

The product of its digits is 15552, while the sum is 35.

The square root of 661166126 is about 25713.1508376550. The cubic root of 661166126 is about 871.1712440930.

The spelling of 661166126 in words is "six hundred sixty-one million, one hundred sixty-six thousand, one hundred twenty-six".