201664042 has 4 divisors (see below), whose sum is σ = 302496066. Its totient is φ = 100832020.

The previous prime is 201664039. The next prime is 201664087. The reversal of 201664042 is 240466102.

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

It can be written as a sum of positive squares in only one way, i.e., 201611601 + 52441 = 14199^2 + 229^2 .

It is a junction number, because it is equal to n+sod(n) for n = 201663998 and 201664016.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50416009 + ... + 50416012.

Almost surely, 2^201664042 is an apocalyptic number.

201664042 is a deficient number, since it is larger than the sum of its proper divisors (100832024).

201664042 is a wasteful number, since it uses less digits than its factorization.

201664042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100832023.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 201664042 is about 14200.8465240633. The cubic root of 201664042 is about 586.4209662563.

The spelling of 201664042 in words is "two hundred one million, six hundred sixty-four thousand, forty-two".