215493991550 has 36 divisors (see below), whose sum is σ = 425783347080. Its totient is φ = 81127144320.

The previous prime is 215493991529. The next prime is 215493991597. The reversal of 215493991550 is 55199394512.

It is a junction number, because it is equal to n+sod(n) for n = 215493991492 and 215493991501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7442090 + ... + 7470989.

Almost surely, 2^215493991550 is an apocalyptic number.

215493991550 is a deficient number, since it is larger than the sum of its proper divisors (210289355530).

215493991550 is a wasteful number, since it uses less digits than its factorization.

215493991550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14913125 (or 14913103 counting only the distinct ones).

The product of its (nonzero) digits is 2187000, while the sum is 53.

The spelling of 215493991550 in words is "two hundred fifteen billion, four hundred ninety-three million, nine hundred ninety-one thousand, five hundred fifty".