3661081055 has 4 divisors (see below), whose sum is σ = 4393297272. Its totient is φ = 2928864840.

The previous prime is 3661081037. The next prime is 3661081057. The reversal of 3661081055 is 5501801663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5501801663 = 31 ⋅177477473.

It is a de Polignac number, because none of the positive numbers 2^k-3661081055 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661081057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366108101 + ... + 366108110.

It is an arithmetic number, because the mean of its divisors is an integer number (1098324318).

Almost surely, 2^3661081055 is an apocalyptic number.

3661081055 is a deficient number, since it is larger than the sum of its proper divisors (732216217).

3661081055 is an equidigital number, since it uses as much as digits as its factorization.

3661081055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732216216.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 3661081055 is about 60506.8678333295. The cubic root of 3661081055 is about 1541.2382595879.

The spelling of 3661081055 in words is "three billion, six hundred sixty-one million, eighty-one thousand, fifty-five".