661774076 has 6 divisors (see below), whose sum is σ = 1158104640. Its totient is φ = 330887036.

The previous prime is 661774067. The next prime is 661774093. The reversal of 661774076 is 670477166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82721756 + ... + 82721763.

It is an arithmetic number, because the mean of its divisors is an integer number (193017440).

Almost surely, 2^661774076 is an apocalyptic number.

It is an amenable number.

661774076 is a deficient number, since it is larger than the sum of its proper divisors (496330564).

661774076 is a wasteful number, since it uses less digits than its factorization.

661774076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165443523 (or 165443521 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 44.

The square root of 661774076 is about 25724.9698930825. The cubic root of 661774076 is about 871.4381796819.

The spelling of 661774076 in words is "six hundred sixty-one million, seven hundred seventy-four thousand, seventy-six".