81152601633 has 12 divisors (see below), whose sum is σ = 124115743908. Its totient is φ = 50919279360.

The previous prime is 81152601587. The next prime is 81152601703. The reversal of 81152601633 is 33610625118.

81152601633 is a `hidden beast` number, since 8 + 1 + 15 + 2 + 6 + 0 + 1 + 633 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24579027729 + 56573573904 = 156777^2 + 237852^2 .

It is not a de Polignac number, because 81152601633 - 2¹⁶ = 81152536097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81152601433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 265204428 + ... + 265204733.

It is an arithmetic number, because the mean of its divisors is an integer number (10342978659).

Almost surely, 2^81152601633 is an apocalyptic number.

It is an amenable number.

81152601633 is a deficient number, since it is larger than the sum of its proper divisors (42963142275).

81152601633 is a wasteful number, since it uses less digits than its factorization.

81152601633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530409184 (or 530409181 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 81152601633 in words is "eighty-one billion, one hundred fifty-two million, six hundred one thousand, six hundred thirty-three".