155666516550 has 48 divisors (see below), whose sum is σ = 396486838992. Its totient is φ = 40389148800.

The previous prime is 155666516549. The next prime is 155666516573. The reversal of 155666516550 is 55615666551.

It is a super-2 number, since 2×155666516550² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 155666516493 and 155666516502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14018461 + ... + 14029560.

It is an arithmetic number, because the mean of its divisors is an integer number (8260142479).

Almost surely, 2^155666516550 is an apocalyptic number.

155666516550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155666516550 is an abundant number, since it is smaller than the sum of its proper divisors (240820322442).

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

155666516550 is a wasteful number, since it uses less digits than its factorization.

155666516550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28048073 (or 28048068 counting only the distinct ones).

The product of its (nonzero) digits is 4050000, while the sum is 51.

The spelling of 155666516550 in words is "one hundred fifty-five billion, six hundred sixty-six million, five hundred sixteen thousand, five hundred fifty".