11556880425 has 18 divisors (see below), whose sum is σ = 20699657342. Its totient is φ = 6163669440.

The previous prime is 11556880399. The next prime is 11556880427. The reversal of 11556880425 is 52408865511.

11556880425 is a `hidden beast` number, since 1 + 1 + 5 + 568 + 80 + 4 + 2 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 1019652624 + 10537227801 = 31932^2 + 102651^2 .

It is not a de Polignac number, because 11556880425 - 2⁹ = 11556879913 is a prime.

It is a super-2 number, since 2×11556880425² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11556880427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 25681732 + ... + 25682181.

Almost surely, 2^11556880425 is an apocalyptic number.

11556880425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11556880425 is a deficient number, since it is larger than the sum of its proper divisors (9142776917).

11556880425 is a wasteful number, since it uses less digits than its factorization.

11556880425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51363929 (or 51363921 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 45.

The spelling of 11556880425 in words is "eleven billion, five hundred fifty-six million, eight hundred eighty thousand, four hundred twenty-five".