661432783051 has 4 divisors (see below), whose sum is σ = 661435864600. Its totient is φ = 661429701504.

The previous prime is 661432783049. The next prime is 661432783171. The reversal of 661432783051 is 150387234166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661432783051 - 2¹ = 661432783049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661432782992 and 661432783010.

It is not an unprimeable number, because it can be changed into a prime (661432723051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1192581 + ... + 1656838.

It is an arithmetic number, because the mean of its divisors is an integer number (165358966150).

Almost surely, 2^661432783051 is an apocalyptic number.

661432783051 is a deficient number, since it is larger than the sum of its proper divisors (3081549).

661432783051 is a wasteful number, since it uses less digits than its factorization.

661432783051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3081548.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 661432783051 in words is "six hundred sixty-one billion, four hundred thirty-two million, seven hundred eighty-three thousand, fifty-one".