27768757451 has 4 divisors (see below), whose sum is σ = 28414542552. Its totient is φ = 27122972352.

The previous prime is 27768757441. The next prime is 27768757567. The reversal of 27768757451 is 15475786772.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 27768757451 - 2¹⁰ = 27768756427 is a prime.

It is a super-2 number, since 2×27768757451² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27768757421) 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, 322892486 + ... + 322892571.

It is an arithmetic number, because the mean of its divisors is an integer number (7103635638).

Almost surely, 2^27768757451 is an apocalyptic number.

27768757451 is a deficient number, since it is larger than the sum of its proper divisors (645785101).

27768757451 is an equidigital number, since it uses as much as digits as its factorization.

27768757451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645785100.

The product of its digits is 23049600, while the sum is 59.

The spelling of 27768757451 in words is "twenty-seven billion, seven hundred sixty-eight million, seven hundred fifty-seven thousand, four hundred fifty-one".