215661453 has 8 divisors (see below), whose sum is σ = 328627008. Its totient is φ = 123235104.

The previous prime is 215661449. The next prime is 215661497. The reversal of 215661453 is 354166512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215661453 - 2² = 215661449 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215661403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5134776 + ... + 5134817.

It is an arithmetic number, because the mean of its divisors is an integer number (41078376).

Almost surely, 2^215661453 is an apocalyptic number.

It is an amenable number.

215661453 is a deficient number, since it is larger than the sum of its proper divisors (112965555).

215661453 is a wasteful number, since it uses less digits than its factorization.

215661453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10269603.

The product of its digits is 21600, while the sum is 33.

The square root of 215661453 is about 14685.4163373055. The cubic root of 215661453 is about 599.6863666410.

The spelling of 215661453 in words is "two hundred fifteen million, six hundred sixty-one thousand, four hundred fifty-three".