581481961953 has 16 divisors (see below), whose sum is σ = 819366508800. Its totient is φ = 365788602000.

The previous prime is 581481961927. The next prime is 581481961961. The reversal of 581481961953 is 359169184185.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-581481961953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (581481961903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20307283 + ... + 20335896.

It is an arithmetic number, because the mean of its divisors is an integer number (51210406800).

Almost surely, 2^581481961953 is an apocalyptic number.

It is an amenable number.

581481961953 is a deficient number, since it is larger than the sum of its proper divisors (237884546847).

581481961953 is a wasteful number, since it uses less digits than its factorization.

581481961953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40643452.

The product of its digits is 9331200, while the sum is 60.

The spelling of 581481961953 in words is "five hundred eighty-one billion, four hundred eighty-one million, nine hundred sixty-one thousand, nine hundred fifty-three".