80477778017 has 12 divisors (see below), whose sum is σ = 100818316116. Its totient is φ = 63674724960.

The previous prime is 80477777999. The next prime is 80477778047. The reversal of 80477778017 is 71087777408.

It can be written as a sum of positive squares in 2 ways, for example, as 6836643856 + 73641134161 = 82684^2 + 271369^2 .

It is not a de Polignac number, because 80477778017 - 2¹⁴ = 80477761633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80477778047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63168734 + ... + 63170007.

It is an arithmetic number, because the mean of its divisors is an integer number (8401526343).

Almost surely, 2^80477778017 is an apocalyptic number.

It is an amenable number.

80477778017 is a deficient number, since it is larger than the sum of its proper divisors (20340538099).

80477778017 is a wasteful number, since it uses less digits than its factorization.

80477778017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126338768 (or 126338761 counting only the distinct ones).

The product of its (nonzero) digits is 4302592, while the sum is 56.

The spelling of 80477778017 in words is "eighty billion, four hundred seventy-seven million, seven hundred seventy-eight thousand, seventeen".