666203542 has 4 divisors (see below), whose sum is σ = 999305316. Its totient is φ = 333101770.

The previous prime is 666203501. The next prime is 666203543. The reversal of 666203542 is 245302666.

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

It is a junction number, because it is equal to n+sod(n) for n = 666203498 and 666203507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666203543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166550884 + ... + 166550887.

It is an arithmetic number, because the mean of its divisors is an integer number (249826329).

Almost surely, 2^666203542 is an apocalyptic number.

666203542 is a deficient number, since it is larger than the sum of its proper divisors (333101774).

666203542 is a wasteful number, since it uses less digits than its factorization.

666203542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333101773.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 666203542 is about 25810.9190460162. The cubic root of 666203542 is about 873.3781295451.

The spelling of 666203542 in words is "six hundred sixty-six million, two hundred three thousand, five hundred forty-two".