1666534254 has 32 divisors (see below), whose sum is σ = 4155515136. Its totient is φ = 432865920.

The previous prime is 1666534231. The next prime is 1666534277. The reversal of 1666534254 is 4524356661.

It is an interprime number because it is at equal distance from previous prime (1666534231) and next prime (1666534277).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1803147 + ... + 1804070.

It is an arithmetic number, because the mean of its divisors is an integer number (129859848).

Almost surely, 2^1666534254 is an apocalyptic number.

1666534254 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1666534254 is an abundant number, since it is smaller than the sum of its proper divisors (2488980882).

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

1666534254 is a wasteful number, since it uses less digits than its factorization.

1666534254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607240.

The product of its digits is 518400, while the sum is 42.

The square root of 1666534254 is about 40823.2072968306. The cubic root of 1666534254 is about 1185.5997021500.

The spelling of 1666534254 in words is "one billion, six hundred sixty-six million, five hundred thirty-four thousand, two hundred fifty-four".