1188216172505 has 8 divisors (see below), whose sum is σ = 1425867940872. Its totient is φ = 950567248768.

The previous prime is 1188216172501. The next prime is 1188216172519. The reversal of 1188216172505 is 5052716128811.

It can be written as a sum of positive squares in 4 ways, for example, as 4010815561 + 1184205356944 = 63331^2 + 1088212^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1188216172505 - 2² = 1188216172501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1188216172505.

It is not an unprimeable number, because it can be changed into a prime (1188216172501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352397 + ... + 1581333.

It is an arithmetic number, because the mean of its divisors is an integer number (178233492609).

Almost surely, 2^{1188216172505} is an apocalyptic number.

It is an amenable number.

1188216172505 is a deficient number, since it is larger than the sum of its proper divisors (237651768367).

1188216172505 is a wasteful number, since it uses less digits than its factorization.

1188216172505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422315.

The product of its (nonzero) digits is 268800, while the sum is 47.

The spelling of 1188216172505 in words is "one trillion, one hundred eighty-eight billion, two hundred sixteen million, one hundred seventy-two thousand, five hundred five".