201984591945 has 64 divisors (see below), whose sum is σ = 348636835584. Its totient is φ = 99494707200.

The previous prime is 201984591931. The next prime is 201984591967. The reversal of 201984591945 is 549195489102.

It is not a de Polignac number, because 201984591945 - 2¹⁰ = 201984590921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2875614 + ... + 2945016.

It is an arithmetic number, because the mean of its divisors is an integer number (5447450556).

Almost surely, 2^201984591945 is an apocalyptic number.

It is an amenable number.

201984591945 is a deficient number, since it is larger than the sum of its proper divisors (146652243639).

201984591945 is a wasteful number, since it uses less digits than its factorization.

201984591945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69642.

The product of its (nonzero) digits is 4665600, while the sum is 57.

The spelling of 201984591945 in words is "two hundred one billion, nine hundred eighty-four million, five hundred ninety-one thousand, nine hundred forty-five".