81380407054 has 4 divisors (see below), whose sum is σ = 122070610584. Its totient is φ = 40690203526.

The previous prime is 81380407037. The next prime is 81380407091. The reversal of 81380407054 is 45070408318.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 81380406998 and 81380407016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20345101762 + ... + 20345101765.

It is an arithmetic number, because the mean of its divisors is an integer number (30517652646).

Almost surely, 2^81380407054 is an apocalyptic number.

81380407054 is a deficient number, since it is larger than the sum of its proper divisors (40690203530).

81380407054 is a wasteful number, since it uses less digits than its factorization.

81380407054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40690203529.

The product of its (nonzero) digits is 107520, while the sum is 40.

The spelling of 81380407054 in words is "eighty-one billion, three hundred eighty million, four hundred seven thousand, fifty-four".