1898405880664 has 32 divisors (see below), whose sum is σ = 3629896079040. Its totient is φ = 930608192800.

The previous prime is 1898405880659. The next prime is 1898405880689. The reversal of 1898405880664 is 4660885048981.

It is a self number, because there is not a number n which added to its sum of digits gives 1898405880664.

It is a congruent number.

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, 10825402 + ... + 10999369.

It is an arithmetic number, because the mean of its divisors is an integer number (113434252470).

Almost surely, 2^{1898405880664} is an apocalyptic number.

It is an amenable number.

1898405880664 is a deficient number, since it is larger than the sum of its proper divisors (1731490198376).

1898405880664 is a wasteful number, since it uses less digits than its factorization.

1898405880664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21824991 (or 21824987 counting only the distinct ones).

The product of its (nonzero) digits is 106168320, while the sum is 67.

The spelling of 1898405880664 in words is "one trillion, eight hundred ninety-eight billion, four hundred five million, eight hundred eighty thousand, six hundred sixty-four".