42132783661 has 4 divisors (see below), whose sum is σ = 43585638300. Its totient is φ = 40679929024.

The previous prime is 42132783659. The next prime is 42132783677. The reversal of 42132783661 is 16638723124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18034878436 + 24097905225 = 134294^2 + 155235^2 .

It is a cyclic number.

It is not a de Polignac number, because 42132783661 - 2¹ = 42132783659 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 (42132783061) 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 3 ways as a sum of consecutive naturals, for example, 726427276 + ... + 726427333.

It is an arithmetic number, because the mean of its divisors is an integer number (10896409575).

Almost surely, 2^42132783661 is an apocalyptic number.

It is an amenable number.

42132783661 is a deficient number, since it is larger than the sum of its proper divisors (1452854639).

42132783661 is a wasteful number, since it uses less digits than its factorization.

42132783661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452854638.

The product of its digits is 290304, while the sum is 43.

The spelling of 42132783661 in words is "forty-two billion, one hundred thirty-two million, seven hundred eighty-three thousand, six hundred sixty-one".