27825777997 has 4 divisors (see below), whose sum is σ = 27828256320. Its totient is φ = 27823299676.

The previous prime is 27825777979. The next prime is 27825778009. The reversal of 27825777997 is 79977752872.

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 a de Polignac number, because none of the positive numbers 2^k-27825777997 is a prime.

It is a super-2 number, since 2×27825777997² (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 (27825777097) 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, 1222243 + ... + 1244800.

It is an arithmetic number, because the mean of its divisors is an integer number (6957064080).

Almost surely, 2^27825777997 is an apocalyptic number.

It is an amenable number.

27825777997 is a deficient number, since it is larger than the sum of its proper divisors (2478323).

27825777997 is a wasteful number, since it uses less digits than its factorization.

27825777997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478322.

The product of its digits is 217818720, while the sum is 70.

The spelling of 27825777997 in words is "twenty-seven billion, eight hundred twenty-five million, seven hundred seventy-seven thousand, nine hundred ninety-seven".