661832783 has 16 divisors (see below), whose sum is σ = 697709376. Its totient is φ = 627144960.

The previous prime is 661832741. The next prime is 661832789. The reversal of 661832783 is 387238166.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661832783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661832789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222341 + ... + 225297.

It is an arithmetic number, because the mean of its divisors is an integer number (43606836).

Almost surely, 2^661832783 is an apocalyptic number.

661832783 is a deficient number, since it is larger than the sum of its proper divisors (35876593).

661832783 is a wasteful number, since it uses less digits than its factorization.

661832783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3154.

The product of its digits is 290304, while the sum is 44.

The square root of 661832783 is about 25726.1109186756. The cubic root of 661832783 is about 871.4639477954.

The spelling of 661832783 in words is "six hundred sixty-one million, eight hundred thirty-two thousand, seven hundred eighty-three".