661005076 has 6 divisors (see below), whose sum is σ = 1156758890. Its totient is φ = 330502536.

The previous prime is 661005071. The next prime is 661005083. The reversal of 661005076 is 670500166.

It can be written as a sum of positive squares in only one way, i.e., 532409476 + 128595600 = 23074^2 + 11340^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661005071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82625631 + ... + 82625638.

Almost surely, 2^661005076 is an apocalyptic number.

It is an amenable number.

661005076 is a deficient number, since it is larger than the sum of its proper divisors (495753814).

661005076 is a wasteful number, since it uses less digits than its factorization.

661005076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165251273 (or 165251271 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 661005076 is about 25710.0189809343. The cubic root of 661005076 is about 871.1005036660.

The spelling of 661005076 in words is "six hundred sixty-one million, five thousand, seventy-six".