215412561556523 has 4 divisors (see below), whose sum is σ = 226750064796360. Its totient is φ = 204075058316688.

The previous prime is 215412561556519. The next prime is 215412561556531. The reversal of 215412561556523 is 325655165214512.

215412561556523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 215412561556523 - 2² = 215412561556519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215412561556573) 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, 5668751619890 + ... + 5668751619927.

It is an arithmetic number, because the mean of its divisors is an integer number (56687516199090).

Almost surely, 2^{215412561556523} is an apocalyptic number.

215412561556523 is a deficient number, since it is larger than the sum of its proper divisors (11337503239837).

215412561556523 is a wasteful number, since it uses less digits than its factorization.

215412561556523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11337503239836.

The product of its digits is 10800000, while the sum is 53.

The spelling of 215412561556523 in words is "two hundred fifteen trillion, four hundred twelve billion, five hundred sixty-one million, five hundred fifty-six thousand, five hundred twenty-three".