215691230953 has 8 divisors (see below), whose sum is σ = 237943340640. Its totient is φ = 193879757280.

The previous prime is 215691230947. The next prime is 215691230957. The reversal of 215691230953 is 359032196512.

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

It is not a de Polignac number, because 215691230953 - 2⁵ = 215691230921 is a prime.

It is a super-2 number, since 2×215691230953² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215691230957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110157975 + ... + 110159932.

It is an arithmetic number, because the mean of its divisors is an integer number (29742917580).

Almost surely, 2^215691230953 is an apocalyptic number.

It is an amenable number.

215691230953 is a deficient number, since it is larger than the sum of its proper divisors (22252109687).

215691230953 is a wasteful number, since it uses less digits than its factorization.

215691230953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220318007.

The product of its (nonzero) digits is 437400, while the sum is 46.

It can be divided in two parts, 215691 and 230953, that added together give a palindrome (446644).

The spelling of 215691230953 in words is "two hundred fifteen billion, six hundred ninety-one million, two hundred thirty thousand, nine hundred fifty-three".