28561511663081 has 8 divisors (see below), whose sum is σ = 29241336648480. Its totient is φ = 27882395940672.

The previous prime is 28561511663071. The next prime is 28561511663119. The reversal of 28561511663081 is 18036611516582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28561511663081 is a prime.

It is a super-2 number, since 2×28561511663081² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28561511663021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177234251 + ... + 177395328.

It is an arithmetic number, because the mean of its divisors is an integer number (3655167081060).

Almost surely, 2^{28561511663081} is an apocalyptic number.

It is an amenable number.

28561511663081 is a deficient number, since it is larger than the sum of its proper divisors (679824985399).

28561511663081 is a wasteful number, since it uses less digits than its factorization.

28561511663081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354631495.

The product of its (nonzero) digits is 2073600, while the sum is 53.

The spelling of 28561511663081 in words is "twenty-eight trillion, five hundred sixty-one billion, five hundred eleven million, six hundred sixty-three thousand, eighty-one".