661827076 has 27 divisors (see below), whose sum is σ = 1224171669. Its totient is φ = 313033968.

The previous prime is 661827073. The next prime is 661827079. The reversal of 661827076 is 670728166.

The square root of 661827076 is 25726.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (661827073) and next prime (661827079).

It can be written as a sum of positive squares in only one way, i.e., 657922500 + 3904576 = 25650^2 + 1976^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661827071) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 977250 + ... + 977926.

Almost surely, 2^661827076 is an apocalyptic number.

661827076 is the 25726-th square number.

It is an amenable number.

661827076 is a deficient number, since it is larger than the sum of its proper divisors (562344593).

661827076 is an equidigital number, since it uses as much as digits as its factorization.

661827076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The cubic root of 661827076 is about 871.4614429033.

The spelling of 661827076 in words is "six hundred sixty-one million, eight hundred twenty-seven thousand, seventy-six".