81380073801 has 64 divisors (see below), whose sum is σ = 128283975680. Its totient is φ = 45439211520.

The previous prime is 81380073781. The next prime is 81380073829. The reversal of 81380073801 is 10837008318.

It is not a de Polignac number, because 81380073801 - 2¹⁹ = 81379549513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81380073801.

It is not an unprimeable number, because it can be changed into a prime (81380073001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2209926 + ... + 2246448.

It is an arithmetic number, because the mean of its divisors is an integer number (2004437120).

Almost surely, 2^81380073801 is an apocalyptic number.

It is an amenable number.

81380073801 is a deficient number, since it is larger than the sum of its proper divisors (46903901879).

81380073801 is a wasteful number, since it uses less digits than its factorization.

81380073801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36686.

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 81380073801 in words is "eighty-one billion, three hundred eighty million, seventy-three thousand, eight hundred one".