27750557531 has 4 divisors (see below), whose sum is σ = 27910965552. Its totient is φ = 27590149512.

The previous prime is 27750557509. The next prime is 27750557543. The reversal of 27750557531 is 13575505772.

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 27750557531 - 2⁶ = 27750557467 is a prime.

It is a super-2 number, since 2×27750557531² (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 (27750557551) 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, 80203751 + ... + 80204096.

It is an arithmetic number, because the mean of its divisors is an integer number (6977741388).

Almost surely, 2^27750557531 is an apocalyptic number.

27750557531 is a deficient number, since it is larger than the sum of its proper divisors (160408021).

27750557531 is a wasteful number, since it uses less digits than its factorization.

27750557531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160408020.

The product of its (nonzero) digits is 1286250, while the sum is 47.

The spelling of 27750557531 in words is "twenty-seven billion, seven hundred fifty million, five hundred fifty-seven thousand, five hundred thirty-one".