2166605542 has 4 divisors (see below), whose sum is σ = 3249908316. Its totient is φ = 1083302770.

The previous prime is 2166605533. The next prime is 2166605557. The reversal of 2166605542 is 2455066612.

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

It is a super-2 number, since 2×2166605542² = 9388359149250227528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541651384 + ... + 541651387.

It is an arithmetic number, because the mean of its divisors is an integer number (812477079).

Almost surely, 2^2166605542 is an apocalyptic number.

2166605542 is a deficient number, since it is larger than the sum of its proper divisors (1083302774).

2166605542 is a wasteful number, since it uses less digits than its factorization.

2166605542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083302773.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 2166605542 is about 46546.8102236877. The cubic root of 2166605542 is about 1293.9771775846.

The spelling of 2166605542 in words is "two billion, one hundred sixty-six million, six hundred five thousand, five hundred forty-two".