216378054185 has 8 divisors (see below), whose sum is σ = 259660937736. Its totient is φ = 173097594880.

The previous prime is 216378054107. The next prime is 216378054251. The reversal of 216378054185 is 581450873612.

It can be written as a sum of positive squares in 4 ways, for example, as 12027947584 + 204350106601 = 109672^2 + 452051^2 .

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

It is not a de Polignac number, because 216378054185 - 2¹⁸ = 216377792041 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403544 + ... + 771753.

It is an arithmetic number, because the mean of its divisors is an integer number (32457617217).

Almost surely, 2^216378054185 is an apocalyptic number.

It is an amenable number.

216378054185 is a deficient number, since it is larger than the sum of its proper divisors (43282883551).

216378054185 is a wasteful number, since it uses less digits than its factorization.

216378054185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212123.

The product of its (nonzero) digits is 1612800, while the sum is 50.

The spelling of 216378054185 in words is "two hundred sixteen billion, three hundred seventy-eight million, fifty-four thousand, one hundred eighty-five".