80625898809 has 9 divisors (see below), whose sum is σ = 116460862063. Its totient is φ = 53750031312.

The previous prime is 80625898807. The next prime is 80625898877. The reversal of 80625898809 is 90889852608.

The square root of 80625898809 is 283947.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 79268713209 + 1357185600 = 281547^2 + 36840^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 80625898809 - 2¹ = 80625898807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80625898807) 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 8 ways as a sum of consecutive naturals, for example, 804517 + ... + 899165.

Almost surely, 2^80625898809 is an apocalyptic number.

80625898809 is the 283947-th square number.

80625898809 is the 141974-th centered octagonal number.

It is an amenable number.

80625898809 is a deficient number, since it is larger than the sum of its proper divisors (35834963254).

80625898809 is an frugal number, since it uses more digits than its factorization.

80625898809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189304 (or 94652 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 63.

The spelling of 80625898809 in words is "eighty billion, six hundred twenty-five million, eight hundred ninety-eight thousand, eight hundred nine".