145666998 has 20 divisors (see below), whose sum is σ = 326402340. Its totient is φ = 48555612.

The previous prime is 145666993. The next prime is 145667009. The reversal of 145666998 is 899666541.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145666993) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 449428 + ... + 449751.

It is an arithmetic number, because the mean of its divisors is an integer number (16320117).

Almost surely, 2^145666998 is an apocalyptic number.

145666998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

145666998 is an abundant number, since it is smaller than the sum of its proper divisors (180735342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145666998 is an equidigital number, since it uses as much as digits as its factorization.

145666998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899193 (or 899184 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 145666998 is about 12069.2583864958. The cubic root of 145666998 is about 526.1631029517.

The spelling of 145666998 in words is "one hundred forty-five million, six hundred sixty-six thousand, nine hundred ninety-eight".