215256755109 has 16 divisors (see below), whose sum is σ = 313115088960. Its totient is φ = 130452658560.

The previous prime is 215256755089. The next prime is 215256755137. The reversal of 215256755109 is 901557652512.

It is not a de Polignac number, because 215256755109 - 2¹³ = 215256746917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215256755149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 644059 + ... + 919415.

It is an arithmetic number, because the mean of its divisors is an integer number (19569693060).

Almost surely, 2^215256755109 is an apocalyptic number.

It is an amenable number.

215256755109 is a deficient number, since it is larger than the sum of its proper divisors (97858333851).

215256755109 is a wasteful number, since it uses less digits than its factorization.

215256755109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299060.

The product of its (nonzero) digits is 945000, while the sum is 48.

The spelling of 215256755109 in words is "two hundred fifteen billion, two hundred fifty-six million, seven hundred fifty-five thousand, one hundred nine".