542555865 has 24 divisors (see below), whose sum is σ = 942002568. Its totient is φ = 288879360.

The previous prime is 542555863. The next prime is 542555873. The reversal of 542555865 is 568555245.

542555865 is a `hidden beast` number, since 542 + 55 + 58 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7420176 + 535135689 = 2724^2 + 23133^2 .

It is not a de Polignac number, because 542555865 - 2¹ = 542555863 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 542555865.

It is not an unprimeable number, because it can be changed into a prime (542555863) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17995 + ... + 37535.

It is an arithmetic number, because the mean of its divisors is an integer number (39250107).

Almost surely, 2^542555865 is an apocalyptic number.

It is an amenable number.

542555865 is a deficient number, since it is larger than the sum of its proper divisors (399446703).

542555865 is a wasteful number, since it uses less digits than its factorization.

542555865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20169 (or 20166 counting only the distinct ones).

The product of its digits is 1200000, while the sum is 45.

The square root of 542555865 is about 23292.8286174093. The cubic root of 542555865 is about 815.6080198165.

The spelling of 542555865 in words is "five hundred forty-two million, five hundred fifty-five thousand, eight hundred sixty-five".