581155862138 has 16 divisors (see below), whose sum is σ = 889036611840. Its totient is φ = 284820880656.

The previous prime is 581155862051. The next prime is 581155862227. The reversal of 581155862138 is 831268551185.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 581155862138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2528270 + ... + 2748537.

It is an arithmetic number, because the mean of its divisors is an integer number (55564788240).

Almost surely, 2^581155862138 is an apocalyptic number.

581155862138 is a deficient number, since it is larger than the sum of its proper divisors (307880749702).

581155862138 is a wasteful number, since it uses less digits than its factorization.

581155862138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277901.

The product of its digits is 2304000, while the sum is 53.

The spelling of 581155862138 in words is "five hundred eighty-one billion, one hundred fifty-five million, eight hundred sixty-two thousand, one hundred thirty-eight".