215778473852 has 6 divisors (see below), whose sum is σ = 377612329248. Its totient is φ = 107889236924.

The previous prime is 215778473837. The next prime is 215778473903. The reversal of 215778473852 is 258374877512.

It is a junction number, because it is equal to n+sod(n) for n = 215778473791 and 215778473800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26972309228 + ... + 26972309235.

It is an arithmetic number, because the mean of its divisors is an integer number (62935388208).

Almost surely, 2^215778473852 is an apocalyptic number.

It is an amenable number.

215778473852 is a deficient number, since it is larger than the sum of its proper divisors (161833855396).

215778473852 is a wasteful number, since it uses less digits than its factorization.

215778473852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53944618467 (or 53944618465 counting only the distinct ones).

The product of its digits is 26342400, while the sum is 59.

The spelling of 215778473852 in words is "two hundred fifteen billion, seven hundred seventy-eight million, four hundred seventy-three thousand, eight hundred fifty-two".