1668149290 has 32 divisors (see below), whose sum is σ = 3138549120. Its totient is φ = 637162944.

The previous prime is 1668149269. The next prime is 1668149291. The reversal of 1668149290 is 929418661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 1668149290.

It is not an unprimeable number, because it can be changed into a prime (1668149291) 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, 136512 + ... + 148228.

It is an arithmetic number, because the mean of its divisors is an integer number (98079660).

Almost surely, 2^1668149290 is an apocalyptic number.

1668149290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1668149290 is a deficient number, since it is larger than the sum of its proper divisors (1470399830).

1668149290 is a wasteful number, since it uses less digits than its factorization.

1668149290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12366.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 1668149290 is about 40842.9833631188. The cubic root of 1668149290 is about 1185.9825661665.

The spelling of 1668149290 in words is "one billion, six hundred sixty-eight million, one hundred forty-nine thousand, two hundred ninety".