661276886 has 8 divisors (see below), whose sum is σ = 992277864. Its totient is φ = 330517600.

The previous prime is 661276877. The next prime is 661276927. The reversal of 661276886 is 688672166.

It is a happy number.

661276886 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 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, 53420 + ... + 64623.

It is an arithmetic number, because the mean of its divisors is an integer number (124034733).

Almost surely, 2^661276886 is an apocalyptic number.

661276886 is a deficient number, since it is larger than the sum of its proper divisors (331000978).

661276886 is a wasteful number, since it uses less digits than its factorization.

661276886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120846.

The product of its digits is 1161216, while the sum is 50.

The square root of 661276886 is about 25715.3045091829. The cubic root of 661276886 is about 871.2198882162.

The spelling of 661276886 in words is "six hundred sixty-one million, two hundred seventy-six thousand, eight hundred eighty-six".