1666082451 has 16 divisors (see below), whose sum is σ = 2506959360. Its totient is φ = 974927520.

The previous prime is 1666082443. The next prime is 1666082459. The reversal of 1666082451 is 1542806661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1666082443) and next prime (1666082459).

It is not a de Polignac number, because 1666082451 - 2³ = 1666082443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666082459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 869515 + ... + 871428.

It is an arithmetic number, because the mean of its divisors is an integer number (156684960).

Almost surely, 2^1666082451 is an apocalyptic number.

1666082451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1666082451 is a deficient number, since it is larger than the sum of its proper divisors (840876909).

1666082451 is a wasteful number, since it uses less digits than its factorization.

1666082451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740986.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 1666082451 is about 40817.6732678383. The cubic root of 1666082451 is about 1185.4925524540.

The spelling of 1666082451 in words is "one billion, six hundred sixty-six million, eighty-two thousand, four hundred fifty-one".