80777971969 has 4 divisors (see below), whose sum is σ = 80988880896. Its totient is φ = 80567063044.

The previous prime is 80777971949. The next prime is 80777971993. The reversal of 80777971969 is 96917977708.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80777971969 - 2³⁵ = 46418233601 is a prime.

It is a super-2 number, since 2×80777971969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80777971898 and 80777971907.

It is not an unprimeable number, because it can be changed into a prime (80777971949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105453889 + ... + 105454654.

It is an arithmetic number, because the mean of its divisors is an integer number (20247220224).

Almost surely, 2^80777971969 is an apocalyptic number.

It is an amenable number.

80777971969 is a deficient number, since it is larger than the sum of its proper divisors (210908927).

80777971969 is a wasteful number, since it uses less digits than its factorization.

80777971969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210908926.

The product of its (nonzero) digits is 84015792, while the sum is 70.

The spelling of 80777971969 in words is "eighty billion, seven hundred seventy-seven million, nine hundred seventy-one thousand, nine hundred sixty-nine".