12155550772553 has 4 divisors (see below), whose sum is σ = 12157180865940. Its totient is φ = 12153920679168.

The previous prime is 12155550772441. The next prime is 12155550772591. The reversal of 12155550772553 is 35527705555121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2322478465024 + 9833072307529 = 1523968^2 + 3135773^2 .

It is a cyclic number.

It is not a de Polignac number, because 12155550772553 - 2¹² = 12155550768457 is a prime.

It is a super-2 number, since 2×12155550772553² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12155550772495 and 12155550772504.

It is not an unprimeable number, because it can be changed into a prime (12155550172553) 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, 815035508 + ... + 815050421.

It is an arithmetic number, because the mean of its divisors is an integer number (3039295216485).

Almost surely, 2^{12155550772553} is an apocalyptic number.

It is an amenable number.

12155550772553 is a deficient number, since it is larger than the sum of its proper divisors (1630093387).

12155550772553 is an equidigital number, since it uses as much as digits as its factorization.

12155550772553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630093386.

The product of its (nonzero) digits is 9187500, while the sum is 53.

The spelling of 12155550772553 in words is "twelve trillion, one hundred fifty-five billion, five hundred fifty million, seven hundred seventy-two thousand, five hundred fifty-three".