27215357261 has 4 divisors (see below), whose sum is σ = 27598672224. Its totient is φ = 26832042300.

The previous prime is 27215357209. The next prime is 27215357263. The reversal of 27215357261 is 16275351272.

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 a cyclic number.

It is not a de Polignac number, because 27215357261 - 2¹⁰ = 27215356237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27215357263) 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 3 ways as a sum of consecutive naturals, for example, 191657375 + ... + 191657516.

It is an arithmetic number, because the mean of its divisors is an integer number (6899668056).

Almost surely, 2^27215357261 is an apocalyptic number.

It is an amenable number.

27215357261 is a deficient number, since it is larger than the sum of its proper divisors (383314963).

27215357261 is an equidigital number, since it uses as much as digits as its factorization.

27215357261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383314962.

The product of its digits is 176400, while the sum is 41.

The spelling of 27215357261 in words is "twenty-seven billion, two hundred fifteen million, three hundred fifty-seven thousand, two hundred sixty-one".