661004983 has 2 divisors, whose sum is σ = 661004984. Its totient is φ = 661004982.

The previous prime is 661004977. The next prime is 661005013. The reversal of 661004983 is 389400166.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661004983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661004933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330502491 + 330502492.

It is an arithmetic number, because the mean of its divisors is an integer number (330502492).

Almost surely, 2^661004983 is an apocalyptic number.

661004983 is a deficient number, since it is larger than the sum of its proper divisors (1).

661004983 is an equidigital number, since it uses as much as digits as its factorization.

661004983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 661004983 is about 25710.0171723008. The cubic root of 661004983 is about 871.1004628129.

The spelling of 661004983 in words is "six hundred sixty-one million, four thousand, nine hundred eighty-three".