27901591669 has 4 divisors (see below), whose sum is σ = 31887533344. Its totient is φ = 23915649996.

The previous prime is 27901591657. The next prime is 27901591693. The reversal of 27901591669 is 96619510972.

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 27901591669 - 2¹³ = 27901583477 is a prime.

It is a super-2 number, since 2×27901591669² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27901591639) 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, 1992970827 + ... + 1992970840.

It is an arithmetic number, because the mean of its divisors is an integer number (7971883336).

Almost surely, 2^27901591669 is an apocalyptic number.

It is an amenable number.

27901591669 is a deficient number, since it is larger than the sum of its proper divisors (3985941675).

27901591669 is an equidigital number, since it uses as much as digits as its factorization.

27901591669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985941674.

The product of its (nonzero) digits is 1837080, while the sum is 55.

The spelling of 27901591669 in words is "twenty-seven billion, nine hundred one million, five hundred ninety-one thousand, six hundred sixty-nine".