3665145142581 has 32 divisors (see below), whose sum is σ = 5573630700288. Its totient is φ = 2122310108160.

The previous prime is 3665145142553. The next prime is 3665145142583. The reversal of 3665145142581 is 1852415415663.

It is not a de Polignac number, because 3665145142581 - 2¹¹ = 3665145140533 is a prime.

It is a super-2 number, since 2×3665145142581² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665145142583) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2254296 + ... + 3523086.

It is an arithmetic number, because the mean of its divisors is an integer number (174175959384).

Almost surely, 2^{3665145142581} is an apocalyptic number.

It is an amenable number.

3665145142581 is a deficient number, since it is larger than the sum of its proper divisors (1908485557707).

3665145142581 is a wasteful number, since it uses less digits than its factorization.

3665145142581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273181.

The product of its digits is 3456000, while the sum is 51.

The spelling of 3665145142581 in words is "three trillion, six hundred sixty-five billion, one hundred forty-five million, one hundred forty-two thousand, five hundred eighty-one".