215867209453 has 16 divisors (see below), whose sum is σ = 252663160960. Its totient is φ = 180612965376.

The previous prime is 215867209427. The next prime is 215867209469. The reversal of 215867209453 is 354902768512.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215867209453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215867209453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215867209153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2127963 + ... + 2227096.

It is an arithmetic number, because the mean of its divisors is an integer number (15791447560).

It is a 1-persistent number, because it is pandigital, but 2⋅215867209453 = 431734418906 is not.

Almost surely, 2^215867209453 is an apocalyptic number.

It is an amenable number.

215867209453 is a deficient number, since it is larger than the sum of its proper divisors (36795951507).

215867209453 is an equidigital number, since it uses as much as digits as its factorization.

215867209453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4355236.

The product of its (nonzero) digits is 3628800, while the sum is 52.

The spelling of 215867209453 in words is "two hundred fifteen billion, eight hundred sixty-seven million, two hundred nine thousand, four hundred fifty-three".