3721280066 has 32 divisors (see below), whose sum is σ = 6479395200. Its totient is φ = 1570012416.

The previous prime is 3721280063. The next prime is 3721280111. The reversal of 3721280066 is 6600821273.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (3721280063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227825 + ... + 243611.

It is an arithmetic number, because the mean of its divisors is an integer number (202481100).

Almost surely, 2^3721280066 is an apocalyptic number.

3721280066 is a deficient number, since it is larger than the sum of its proper divisors (2758115134).

3721280066 is a wasteful number, since it uses less digits than its factorization.

3721280066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16058.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 3721280066 is about 61002.2955797567. The cubic root of 3721280066 is about 1549.6398838734.

The spelling of 3721280066 in words is "three billion, seven hundred twenty-one million, two hundred eighty thousand, sixty-six".