81563229001 has 4 divisors (see below), whose sum is σ = 81569925072. Its totient is φ = 81556532932.

The previous prime is 81563228969. The next prime is 81563229053. The reversal of 81563229001 is 10092236518.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81563229001 - 2⁵ = 81563228969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81563229071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3329731 + ... + 3354136.

It is an arithmetic number, because the mean of its divisors is an integer number (20392481268).

Almost surely, 2^81563229001 is an apocalyptic number.

It is an amenable number.

81563229001 is a deficient number, since it is larger than the sum of its proper divisors (6696071).

81563229001 is a wasteful number, since it uses less digits than its factorization.

81563229001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6696070.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 81563229001 in words is "eighty-one billion, five hundred sixty-three million, two hundred twenty-nine thousand, one".