981814666 has 48 divisors (see below), whose sum is σ = 1747072800. Its totient is φ = 412540128.

The previous prime is 981814663. The next prime is 981814667. The reversal of 981814666 is 666418189.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (981814661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1142545 + ... + 1143403.

It is an arithmetic number, because the mean of its divisors is an integer number (36397350).

Almost surely, 2^981814666 is an apocalyptic number.

981814666 is a deficient number, since it is larger than the sum of its proper divisors (765258134).

981814666 is a wasteful number, since it uses less digits than its factorization.

981814666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091 (or 1084 counting only the distinct ones).

The product of its digits is 497664, while the sum is 49.

The square root of 981814666 is about 31333.9219696482. The cubic root of 981814666 is about 993.9011010510.

The spelling of 981814666 in words is "nine hundred eighty-one million, eight hundred fourteen thousand, six hundred sixty-six".