3660139581 has 16 divisors (see below), whose sum is σ = 5578473600. Its totient is φ = 2091089088.

The previous prime is 3660139579. The next prime is 3660139591. The reversal of 3660139581 is 1859310663.

It is a happy number.

3660139581 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3660139581 - 2¹ = 3660139579 is a prime.

It is a super-2 number, since 2×3660139581² = 26793243504805711122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3660139591) 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, 112155 + ... + 141063.

It is an arithmetic number, because the mean of its divisors is an integer number (348654600).

Almost surely, 2^3660139581 is an apocalyptic number.

It is an amenable number.

3660139581 is a deficient number, since it is larger than the sum of its proper divisors (1918334019).

3660139581 is a wasteful number, since it uses less digits than its factorization.

3660139581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34948.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 3660139581 is about 60499.0874393986. The cubic root of 3660139581 is about 1541.1061346658.

The spelling of 3660139581 in words is "three billion, six hundred sixty million, one hundred thirty-nine thousand, five hundred eighty-one".