4120415661 has 16 divisors (see below), whose sum is σ = 5735903616. Its totient is φ = 2626067136.

The previous prime is 4120415653. The next prime is 4120415669. The reversal of 4120415661 is 1665140214.

It is an interprime number because it is at equal distance from previous prime (4120415653) and next prime (4120415669).

It is not a de Polignac number, because 4120415661 - 2³ = 4120415653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4120415669) 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, 117931 + ... + 148823.

It is an arithmetic number, because the mean of its divisors is an integer number (358493976).

Almost surely, 2^4120415661 is an apocalyptic number.

It is an amenable number.

4120415661 is a deficient number, since it is larger than the sum of its proper divisors (1615487955).

4120415661 is a wasteful number, since it uses less digits than its factorization.

4120415661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32852.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 4120415661 is about 64190.4639413052. The cubic root of 4120415661 is about 1603.1728265993.

Adding to 4120415661 its reverse (1665140214), we get a palindrome (5785555875).

It can be divided in two parts, 41204 and 15661, that added together give a palindrome (56865).

The spelling of 4120415661 in words is "four billion, one hundred twenty million, four hundred fifteen thousand, six hundred sixty-one".