215795553445 has 32 divisors (see below), whose sum is σ = 276398892000. Its totient is φ = 161173733376.

The previous prime is 215795553437. The next prime is 215795553451. The reversal of 215795553445 is 544355597512.

It is a happy number.

It is a Cunningham number, because it is equal to 464538²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 31519386369 + 184276167076 = 177537^2 + 429274^2 .

It is a cyclic number.

It is not a de Polignac number, because 215795553445 - 2³ = 215795553437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9728307 + ... + 9750463.

It is an arithmetic number, because the mean of its divisors is an integer number (8637465375).

Almost surely, 2^215795553445 is an apocalyptic number.

It is an amenable number.

215795553445 is a deficient number, since it is larger than the sum of its proper divisors (60603338555).

215795553445 is a wasteful number, since it uses less digits than its factorization.

215795553445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23097.

The product of its digits is 18900000, while the sum is 55.

The spelling of 215795553445 in words is "two hundred fifteen billion, seven hundred ninety-five million, five hundred fifty-three thousand, four hundred forty-five".