27780125643 has 24 divisors (see below), whose sum is σ = 41572112400. Its totient is φ = 17854933824.

The previous prime is 27780125591. The next prime is 27780125677. The reversal of 27780125643 is 34652108772.

27780125643 is a `hidden beast` number, since 2 + 7 + 7 + 80 + 1 + 2 + 564 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-27780125643 is a prime.

It is a super-3 number, since 3×27780125643³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (27780125143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98088 + ... + 255306.

It is an arithmetic number, because the mean of its divisors is an integer number (1732171350).

Almost surely, 2^27780125643 is an apocalyptic number.

27780125643 is a deficient number, since it is larger than the sum of its proper divisors (13791986757).

27780125643 is a wasteful number, since it uses less digits than its factorization.

27780125643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157931 (or 157928 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 27780125643 in words is "twenty-seven billion, seven hundred eighty million, one hundred twenty-five thousand, six hundred forty-three".