4121561808 has 120 divisors (see below), whose sum is σ = 14196535808. Its totient is φ = 1087001856.

The previous prime is 4121561791. The next prime is 4121561819. The reversal of 4121561808 is 8081651214.

4121561808 is a `hidden beast` number, since 4 + 12 + 1 + 561 + 80 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144160 + ... + 170367.

Almost surely, 2^4121561808 is an apocalyptic number.

4121561808 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

4121561808 is an abundant number, since it is smaller than the sum of its proper divisors (10074974000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4121561808 is a wasteful number, since it uses less digits than its factorization.

4121561808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314561 (or 314552 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 4121561808 is about 64199.3910251491. The cubic root of 4121561808 is about 1603.3214605827.

The spelling of 4121561808 in words is "four billion, one hundred twenty-one million, five hundred sixty-one thousand, eight hundred eight".