80511381561 has 8 divisors (see below), whose sum is σ = 115606086400. Its totient is φ = 49545465552.

The previous prime is 80511381541. The next prime is 80511381581. The reversal of 80511381561 is 16518311508.

It is an interprime number because it is at equal distance from previous prime (80511381541) and next prime (80511381581).

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

It is not a de Polignac number, because 80511381561 - 2⁶ = 80511381497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2064394399 = 80511381561 / (8 + 0 + 5 + 1 + 1 + 3 + 8 + 1 + 5 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80511381521) 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, 1032197161 + ... + 1032197238.

It is an arithmetic number, because the mean of its divisors is an integer number (14450760800).

Almost surely, 2^80511381561 is an apocalyptic number.

It is an amenable number.

80511381561 is a deficient number, since it is larger than the sum of its proper divisors (35094704839).

80511381561 is a wasteful number, since it uses less digits than its factorization.

80511381561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064394415.

The product of its (nonzero) digits is 28800, while the sum is 39.

The spelling of 80511381561 in words is "eighty billion, five hundred eleven million, three hundred eighty-one thousand, five hundred sixty-one".