2581312516133 has 24 divisors (see below), whose sum is σ = 2865183742080. Its totient is φ = 2323243278720.

The previous prime is 2581312516129. The next prime is 2581312516157. The reversal of 2581312516133 is 3316152131852.

It is not a de Polignac number, because 2581312516133 - 2² = 2581312516129 is a prime.

It is a super-3 number, since 3×2581312516133³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581312516193) 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, 3822788 + ... + 4447058.

It is an arithmetic number, because the mean of its divisors is an integer number (119382655920).

Almost surely, 2^{2581312516133} is an apocalyptic number.

It is an amenable number.

2581312516133 is a deficient number, since it is larger than the sum of its proper divisors (283871225947).

2581312516133 is a wasteful number, since it uses less digits than its factorization.

2581312516133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624909 (or 624896 counting only the distinct ones).

The product of its digits is 129600, while the sum is 41.

Adding to 2581312516133 its reverse (3316152131852), we get a palindrome (5897464647985).

The spelling of 2581312516133 in words is "two trillion, five hundred eighty-one billion, three hundred twelve million, five hundred sixteen thousand, one hundred thirty-three".