81507202099 has 8 divisors (see below), whose sum is σ = 83503628208. Its totient is φ = 79511178240.

The previous prime is 81507202081. The next prime is 81507202103. The reversal of 81507202099 is 99020270518.

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

It is a cyclic number.

It is not a de Polignac number, because 81507202099 - 2⁵ = 81507202067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81507202009) 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 7 ways as a sum of consecutive naturals, for example, 332179 + ... + 522835.

It is an arithmetic number, because the mean of its divisors is an integer number (10437953526).

Almost surely, 2^81507202099 is an apocalyptic number.

81507202099 is a deficient number, since it is larger than the sum of its proper divisors (1996426109).

81507202099 is a wasteful number, since it uses less digits than its factorization.

81507202099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201125.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 81507202099 in words is "eighty-one billion, five hundred seven million, two hundred two thousand, ninety-nine".