42661684947 has 32 divisors (see below), whose sum is σ = 65181473280. Its totient is φ = 24313259520.

The previous prime is 42661684913. The next prime is 42661684963. The reversal of 42661684947 is 74948616624.

It is not a de Polignac number, because 42661684947 - 2²³ = 42653296339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42661684547) 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, 21556204 + ... + 21558182.

It is an arithmetic number, because the mean of its divisors is an integer number (2036921040).

Almost surely, 2^42661684947 is an apocalyptic number.

42661684947 is a deficient number, since it is larger than the sum of its proper divisors (22519788333).

42661684947 is a wasteful number, since it uses less digits than its factorization.

42661684947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4203.

The product of its digits is 13934592, while the sum is 57.

The spelling of 42661684947 in words is "forty-two billion, six hundred sixty-one million, six hundred eighty-four thousand, nine hundred forty-seven".