80817126451 has 4 divisors (see below), whose sum is σ = 82696594552. Its totient is φ = 78937658352.

The previous prime is 80817126413. The next prime is 80817126517. The reversal of 80817126451 is 15462171808.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80817126451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1879468057 = 80817126451 / (8 + 0 + 8 + 1 + 7 + 1 + 2 + 6 + 4 + 5 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80817126398 and 80817126407.

It is not an unprimeable number, because it can be changed into a prime (80817127451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939733986 + ... + 939734071.

It is an arithmetic number, because the mean of its divisors is an integer number (20674148638).

Almost surely, 2^80817126451 is an apocalyptic number.

80817126451 is a deficient number, since it is larger than the sum of its proper divisors (1879468101).

80817126451 is a wasteful number, since it uses less digits than its factorization.

80817126451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879468100.

The product of its (nonzero) digits is 107520, while the sum is 43.

The spelling of 80817126451 in words is "eighty billion, eight hundred seventeen million, one hundred twenty-six thousand, four hundred fifty-one".