3661525111 has 4 divisors (see below), whose sum is σ = 3668029272. Its totient is φ = 3655020952.

The previous prime is 3661525097. The next prime is 3661525117. The reversal of 3661525111 is 1115251663.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1115251663 = 17 ⋅65603039.

It is a cyclic number.

It is not a de Polignac number, because 3661525111 - 2⁵ = 3661525079 is a prime.

It is a super-2 number, since 2×3661525111² = 26813532276967124642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661525117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3251236 + ... + 3252361.

It is an arithmetic number, because the mean of its divisors is an integer number (917007318).

Almost surely, 2^3661525111 is an apocalyptic number.

3661525111 is a deficient number, since it is larger than the sum of its proper divisors (6504161).

3661525111 is an equidigital number, since it uses as much as digits as its factorization.

3661525111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6504160.

The product of its digits is 5400, while the sum is 31.

The square root of 3661525111 is about 60510.5371898151. The cubic root of 3661525111 is about 1541.3005698198.

Adding to 3661525111 its reverse (1115251663), we get a palindrome (4776776774).

The spelling of 3661525111 in words is "three billion, six hundred sixty-one million, five hundred twenty-five thousand, one hundred eleven".