201981960394 has 8 divisors (see below), whose sum is σ = 313420283460. Its totient is φ = 97508532576.

The previous prime is 201981960361. The next prime is 201981960449. The reversal of 201981960394 is 493069189102.

It can be written as a sum of positive squares in 2 ways, for example, as 201589326169 + 392634225 = 448987^2 + 19815^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1741223739 + ... + 1741223854.

Almost surely, 2^201981960394 is an apocalyptic number.

201981960394 is a deficient number, since it is larger than the sum of its proper divisors (111438323066).

201981960394 is a wasteful number, since it uses less digits than its factorization.

201981960394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3482447624.

The product of its (nonzero) digits is 839808, while the sum is 52.

The spelling of 201981960394 in words is "two hundred one billion, nine hundred eighty-one million, nine hundred sixty thousand, three hundred ninety-four".