661232130643 has 16 divisors (see below), whose sum is σ = 760564659456. Its totient is φ = 563128996320.

The previous prime is 661232130619. The next prime is 661232130697. The reversal of 661232130643 is 346031232166.

It is a cyclic number.

It is not a de Polignac number, because 661232130643 - 2³³ = 652642196051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661232130443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191880 + ... + 1165882.

It is an arithmetic number, because the mean of its divisors is an integer number (47535291216).

Almost surely, 2^661232130643 is an apocalyptic number.

661232130643 is a deficient number, since it is larger than the sum of its proper divisors (99332528813).

661232130643 is a wasteful number, since it uses less digits than its factorization.

661232130643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974634.

The product of its (nonzero) digits is 93312, while the sum is 37.

The spelling of 661232130643 in words is "six hundred sixty-one billion, two hundred thirty-two million, one hundred thirty thousand, six hundred forty-three".