3666021540 has 48 divisors (see below), whose sum is σ = 10301437440. Its totient is φ = 974122240.

The previous prime is 3666021533. The next prime is 3666021551. The reversal of 3666021540 is 451206663.

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 in 15 ways as a sum of consecutive naturals, for example, 91860 + ... + 125579.

It is an arithmetic number, because the mean of its divisors is an integer number (214613280).

Almost surely, 2^3666021540 is an apocalyptic number.

3666021540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3666021540 is an abundant number, since it is smaller than the sum of its proper divisors (6635415900).

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

3666021540 is a wasteful number, since it uses less digits than its factorization.

3666021540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217732 (or 217730 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 3666021540 is about 60547.6798894887. The cubic root of 3666021540 is about 1541.9312281232.

The spelling of 3666021540 in words is "three billion, six hundred sixty-six million, twenty-one thousand, five hundred forty".