653212018 has 4 divisors (see below), whose sum is σ = 979818030. Its totient is φ = 326606008.

The previous prime is 653211919. The next prime is 653212019. The reversal of 653212018 is 810212356.

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., 571544649 + 81667369 = 23907^2 + 9037^2 .

It is not an unprimeable number, because it can be changed into a prime (653212019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163303003 + ... + 163303006.

Almost surely, 2^653212018 is an apocalyptic number.

653212018 is a deficient number, since it is larger than the sum of its proper divisors (326606012).

653212018 is a wasteful number, since it uses less digits than its factorization.

653212018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326606011.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 653212018 is about 25558.0127944252. The cubic root of 653212018 is about 867.6636207469.

The spelling of 653212018 in words is "six hundred fifty-three million, two hundred twelve thousand, eighteen".