201816572456 has 32 divisors (see below), whose sum is σ = 384247514880. Its totient is φ = 99354360000.

The previous prime is 201816572429. The next prime is 201816572467. The reversal of 201816572456 is 654275618102.

It is a self number, because there is not a number n which added to its sum of digits gives 201816572456.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190010 + ... + 663126.

It is an arithmetic number, because the mean of its divisors is an integer number (12007734840).

Almost surely, 2^201816572456 is an apocalyptic number.

It is an amenable number.

201816572456 is a deficient number, since it is larger than the sum of its proper divisors (182430942424).

201816572456 is a wasteful number, since it uses less digits than its factorization.

201816572456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473945 (or 473941 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 201816572456 in words is "two hundred one billion, eight hundred sixteen million, five hundred seventy-two thousand, four hundred fifty-six".