66143490 has 64 divisors (see below), whose sum is σ = 187695360. Its totient is φ = 14595840.

The previous prime is 66143479. The next prime is 66143501. The reversal of 66143490 is 9434166.

It is an interprime number because it is at equal distance from previous prime (66143479) and next prime (66143501).

It is a super-2 number, since 2×66143490² = 8749922538760200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 660 + ... + 11520.

It is an arithmetic number, because the mean of its divisors is an integer number (2932740).

Almost surely, 2^66143490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66143490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93847680).

66143490 is an abundant number, since it is smaller than the sum of its proper divisors (121551870).

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

66143490 is a wasteful number, since it uses less digits than its factorization.

66143490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10907.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 66143490 is about 8132.8648089096. The cubic root of 66143490 is about 404.4166575177.

The spelling of 66143490 in words is "sixty-six million, one hundred forty-three thousand, four hundred ninety".