215634542634461 has 4 divisors (see below), whose sum is σ = 215634572166300. Its totient is φ = 215634513102624.

The previous prime is 215634542634457. The next prime is 215634542634559. The reversal of 215634542634461 is 164436245436512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 128303760765625 + 87330781868836 = 11327125^2 + 9345094^2 .

It is a cyclic number.

It is not a de Polignac number, because 215634542634461 - 2² = 215634542634457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215634542634397 and 215634542634406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215634542634361) 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, 5060225 + ... + 21374633.

It is an arithmetic number, because the mean of its divisors is an integer number (53908643041575).

Almost surely, 2^{215634542634461} is an apocalyptic number.

It is an amenable number.

215634542634461 is a deficient number, since it is larger than the sum of its proper divisors (29531839).

215634542634461 is a wasteful number, since it uses less digits than its factorization.

215634542634461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29531838.

The product of its digits is 49766400, while the sum is 56.

The spelling of 215634542634461 in words is "two hundred fifteen trillion, six hundred thirty-four billion, five hundred forty-two million, six hundred thirty-four thousand, four hundred sixty-one".