201601621636 has 12 divisors (see below), whose sum is σ = 352840908112. Its totient is φ = 100789933608.

The previous prime is 201601621621. The next prime is 201601621651. The reversal of 201601621636 is 636126106102.

It is an interprime number because it is at equal distance from previous prime (201601621621) and next prime (201601621651).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2677530 + ... + 2751793.

Almost surely, 2^201601621636 is an apocalyptic number.

It is an amenable number.

201601621636 is a deficient number, since it is larger than the sum of its proper divisors (151239286476).

201601621636 is a wasteful number, since it uses less digits than its factorization.

201601621636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5438610 (or 5438608 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

Adding to 201601621636 its reverse (636126106102), we get a palindrome (837727727738).

The spelling of 201601621636 in words is "two hundred one billion, six hundred one million, six hundred twenty-one thousand, six hundred thirty-six".