145821668 has 6 divisors (see below), whose sum is σ = 255187926. Its totient is φ = 72910832.

The previous prime is 145821653. The next prime is 145821677. The reversal of 145821668 is 866128541.

It can be written as a sum of positive squares in only one way, i.e., 139051264 + 6770404 = 11792^2 + 2602^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18227705 + ... + 18227712.

It is an arithmetic number, because the mean of its divisors is an integer number (42531321).

Almost surely, 2^145821668 is an apocalyptic number.

It is an amenable number.

145821668 is a deficient number, since it is larger than the sum of its proper divisors (109366258).

145821668 is a wasteful number, since it uses less digits than its factorization.

145821668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36455421 (or 36455419 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 145821668 is about 12075.6642881458. The cubic root of 145821668 is about 526.3492646800.

The spelling of 145821668 in words is "one hundred forty-five million, eight hundred twenty-one thousand, six hundred sixty-eight".