80565601778 has 8 divisors (see below), whose sum is σ = 123658830768. Its totient is φ = 39345991524.

The previous prime is 80565601769. The next prime is 80565601801. The reversal of 80565601778 is 87710656508.

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

It is a super-2 number, since 2×80565601778² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 468404576 + ... + 468404747.

It is an arithmetic number, because the mean of its divisors is an integer number (15457353846).

Almost surely, 2^80565601778 is an apocalyptic number.

80565601778 is a deficient number, since it is larger than the sum of its proper divisors (43093228990).

80565601778 is a wasteful number, since it uses less digits than its factorization.

80565601778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936809368.

The product of its (nonzero) digits is 2822400, while the sum is 53.

The spelling of 80565601778 in words is "eighty billion, five hundred sixty-five million, six hundred one thousand, seven hundred seventy-eight".