661604920083 has 32 divisors (see below), whose sum is σ = 991307246400. Its totient is φ = 436053024000.

The previous prime is 661604920079. The next prime is 661604920091. The reversal of 661604920083 is 380029406166.

661604920083 is a `hidden beast` number, since 6 + 616 + 0 + 4 + 9 + 20 + 0 + 8 + 3 = 666.

661604920083 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661604920083 - 2² = 661604920079 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661604920003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22720233 + ... + 22749333.

It is an arithmetic number, because the mean of its divisors is an integer number (30978351450).

Almost surely, 2^661604920083 is an apocalyptic number.

661604920083 is a deficient number, since it is larger than the sum of its proper divisors (329702326317).

661604920083 is a wasteful number, since it uses less digits than its factorization.

661604920083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38660 (or 38654 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 661604920083 in words is "six hundred sixty-one billion, six hundred four million, nine hundred twenty thousand, eighty-three".