215654993553 has 4 divisors (see below), whose sum is σ = 287539991408. Its totient is φ = 143769995700.

The previous prime is 215654993551. The next prime is 215654993563. The reversal of 215654993553 is 355399456512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 215654993553 - 2¹ = 215654993551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215654993493 and 215654993502.

It is not an unprimeable number, because it can be changed into a prime (215654993551) 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, 35942498923 + ... + 35942498928.

It is an arithmetic number, because the mean of its divisors is an integer number (71884997852).

Almost surely, 2^215654993553 is an apocalyptic number.

It is an amenable number.

215654993553 is a deficient number, since it is larger than the sum of its proper divisors (71884997855).

215654993553 is an equidigital number, since it uses as much as digits as its factorization.

215654993553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71884997854.

The product of its digits is 21870000, while the sum is 57.

The spelling of 215654993553 in words is "two hundred fifteen billion, six hundred fifty-four million, nine hundred ninety-three thousand, five hundred fifty-three".