661000616 has 8 divisors (see below), whose sum is σ = 1239376170. Its totient is φ = 330500304.

The previous prime is 661000591. The next prime is 661000651. The reversal of 661000616 is 616000166.

It can be written as a sum of positive squares in only one way, i.e., 455651716 + 205348900 = 21346^2 + 14330^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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, 41312531 + ... + 41312546.

Almost surely, 2^661000616 is an apocalyptic number.

It is an amenable number.

661000616 is a deficient number, since it is larger than the sum of its proper divisors (578375554).

661000616 is a wasteful number, since it uses less digits than its factorization.

661000616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82625083 (or 82625079 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 661000616 is about 25709.9322441737. The cubic root of 661000616 is about 871.0985444693.

The spelling of 661000616 in words is "six hundred sixty-one million, six hundred sixteen", and thus it is an aban number.