27457575727391 has 4 divisors (see below), whose sum is σ = 27609275040984. Its totient is φ = 27305876413800.

The previous prime is 27457575727367. The next prime is 27457575727481. The reversal of 27457575727391 is 19372757575472.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27457575727391 is a prime.

It is a super-2 number, since 2×27457575727391² (a number of 28 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 (27457575727891) 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, 75849656525 + ... + 75849656886.

It is an arithmetic number, because the mean of its divisors is an integer number (6902318760246).

Almost surely, 2^{27457575727391} is an apocalyptic number.

27457575727391 is a deficient number, since it is larger than the sum of its proper divisors (151699313593).

27457575727391 is a wasteful number, since it uses less digits than its factorization.

27457575727391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151699313592.

The product of its digits is 907578000, while the sum is 71.

The spelling of 27457575727391 in words is "twenty-seven trillion, four hundred fifty-seven billion, five hundred seventy-five million, seven hundred twenty-seven thousand, three hundred ninety-one".