81569135404001 has 32 divisors (see below), whose sum is σ = 94064990772480. Its totient is φ = 69285974171904.

The previous prime is 81569135403991. The next prime is 81569135404007. The reversal of 81569135404001 is 10040453196518.

It is not a de Polignac number, because 81569135404001 - 2⁶ = 81569135403937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81569135404007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2295570431 + ... + 2295605963.

It is an arithmetic number, because the mean of its divisors is an integer number (2939530961640).

Almost surely, 2^{81569135404001} is an apocalyptic number.

It is an amenable number.

81569135404001 is a deficient number, since it is larger than the sum of its proper divisors (12495855368479).

81569135404001 is a wasteful number, since it uses less digits than its factorization.

81569135404001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39945.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 81569135404001 in words is "eighty-one trillion, five hundred sixty-nine billion, one hundred thirty-five million, four hundred four thousand, one".