80756749477 has 4 divisors (see below), whose sum is σ = 81556321356. Its totient is φ = 79957177600.

The previous prime is 80756749399. The next prime is 80756749499. The reversal of 80756749477 is 77494765708.

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

It can be written as a sum of positive squares in 2 ways, for example, as 79840718721 + 916030756 = 282561^2 + 30266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80756749477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80756749277) 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 3 ways as a sum of consecutive naturals, for example, 399785788 + ... + 399785989.

It is an arithmetic number, because the mean of its divisors is an integer number (20389080339).

Almost surely, 2^80756749477 is an apocalyptic number.

It is an amenable number.

80756749477 is a deficient number, since it is larger than the sum of its proper divisors (799571879).

80756749477 is a wasteful number, since it uses less digits than its factorization.

80756749477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799571878.

The product of its (nonzero) digits is 82978560, while the sum is 64.

The spelling of 80756749477 in words is "eighty billion, seven hundred fifty-six million, seven hundred forty-nine thousand, four hundred seventy-seven".