215351204551 has 8 divisors (see below), whose sum is σ = 246119245344. Its totient is φ = 184584059520.

The previous prime is 215351204501. The next prime is 215351204569. The reversal of 215351204551 is 155402153512.

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

It is not a de Polignac number, because 215351204551 - 2¹⁹ = 215350680263 is a prime.

It is a super-2 number, since 2×215351204551² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215351204501) 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, 411411 + ... + 774571.

It is an arithmetic number, because the mean of its divisors is an integer number (30764905668).

Almost surely, 2^215351204551 is an apocalyptic number.

215351204551 is a deficient number, since it is larger than the sum of its proper divisors (30768040793).

215351204551 is an equidigital number, since it uses as much as digits as its factorization.

215351204551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447881.

The product of its (nonzero) digits is 30000, while the sum is 34.

The spelling of 215351204551 in words is "two hundred fifteen billion, three hundred fifty-one million, two hundred four thousand, five hundred fifty-one".