4851199021581 has 48 divisors (see below), whose sum is σ = 7794952993152. Its totient is φ = 2882747664000.

The previous prime is 4851199021429. The next prime is 4851199021597. The reversal of 4851199021581 is 1851209911584.

4851199021581 is a `hidden beast` number, since 4 + 8 + 51 + 1 + 9 + 9 + 0 + 2 + 1 + 581 = 666.

It is not a de Polignac number, because 4851199021581 - 2¹⁸ = 4851198759437 is a prime.

It is a super-2 number, since 2×4851199021581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4851199121581) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1325290 + ... + 3385083.

It is an arithmetic number, because the mean of its divisors is an integer number (162394854024).

Almost surely, 2^{4851199021581} is an apocalyptic number.

It is an amenable number.

4851199021581 is a deficient number, since it is larger than the sum of its proper divisors (2943753971571).

4851199021581 is a wasteful number, since it uses less digits than its factorization.

4851199021581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4710594 (or 4710591 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 54.

The spelling of 4851199021581 in words is "four trillion, eight hundred fifty-one billion, one hundred ninety-nine million, twenty-one thousand, five hundred eighty-one".