81388713801 has 8 divisors (see below), whose sum is σ = 108768906400. Its totient is φ = 54133831872.

The previous prime is 81388713799. The next prime is 81388713803. The reversal of 81388713801 is 10831788318.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81388713799) and next prime (81388713803).

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

It is not a de Polignac number, because 81388713801 - 2¹ = 81388713799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81388713803) 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, 31326151 + ... + 31328748.

It is an arithmetic number, because the mean of its divisors is an integer number (13596113300).

Almost surely, 2^81388713801 is an apocalyptic number.

It is an amenable number.

81388713801 is a deficient number, since it is larger than the sum of its proper divisors (27380192599).

81388713801 is a wasteful number, since it uses less digits than its factorization.

81388713801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62655335.

The product of its (nonzero) digits is 258048, while the sum is 48.

The spelling of 81388713801 in words is "eighty-one billion, three hundred eighty-eight million, seven hundred thirteen thousand, eight hundred one".