215078730093 has 12 divisors (see below), whose sum is σ = 310806225340. Its totient is φ = 143322613056.

The previous prime is 215078730049. The next prime is 215078730149. The reversal of 215078730093 is 390037870512.

It is a happy number.

215078730093 is a `hidden beast` number, since 21 + 507 + 8 + 7 + 30 + 0 + 93 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 55815480009 + 159263250084 = 236253^2 + 399078^2 .

It is not a de Polignac number, because 215078730093 - 2⁹ = 215078729581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215078730043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5245696 + ... + 5286537.

Almost surely, 2^215078730093 is an apocalyptic number.

It is an amenable number.

215078730093 is a deficient number, since it is larger than the sum of its proper divisors (95727495247).

215078730093 is a wasteful number, since it uses less digits than its factorization.

215078730093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10534508 (or 10534505 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The spelling of 215078730093 in words is "two hundred fifteen billion, seventy-eight million, seven hundred thirty thousand, ninety-three".