215112051511 has 4 divisors (see below), whose sum is σ = 245842344592. Its totient is φ = 184381758432.

The previous prime is 215112051443. The next prime is 215112051551. The reversal of 215112051511 is 115150211512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215112051511 - 2²⁷ = 214977833783 is a prime.

It is a super-2 number, since 2×215112051511² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215112051551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15365146530 + ... + 15365146543.

It is an arithmetic number, because the mean of its divisors is an integer number (61460586148).

Almost surely, 2^215112051511 is an apocalyptic number.

215112051511 is a deficient number, since it is larger than the sum of its proper divisors (30730293081).

215112051511 is an equidigital number, since it uses as much as digits as its factorization.

215112051511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30730293080.

The product of its (nonzero) digits is 500, while the sum is 25.

The spelling of 215112051511 in words is "two hundred fifteen billion, one hundred twelve million, fifty-one thousand, five hundred eleven".