771980161922 has 30 divisors (see below), whose sum is σ = 1223012069529. Its totient is φ = 365462335440.

The previous prime is 771980161913. The next prime is 771980161943. The reversal of 771980161922 is 229161089177.

It can be written as a sum of positive squares in 2 ways, for example, as 725220856801 + 46759305121 = 851599^2 + 216239^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=621281.

It is a super-2 number, since 2×771980161922² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 448564022 + ... + 448565742.

Almost surely, 2^771980161922 is an apocalyptic number.

771980161922 is a deficient number, since it is larger than the sum of its proper divisors (451031907607).

771980161922 is an frugal number, since it uses more digits than its factorization.

771980161922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520 (or 1742 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 53.

The spelling of 771980161922 in words is "seven hundred seventy-one billion, nine hundred eighty million, one hundred sixty-one thousand, nine hundred twenty-two".