773975898081 has 45 divisors (see below), whose sum is σ = 1163889737571. Its totient is φ = 512568707616.

The previous prime is 773975898071. The next prime is 773975898083. The reversal of 773975898081 is 180898579377.

It is a happy number.

The square root of 773975898081 is 879759.

It is a perfect power (a square), and thus also a powerful number.

773975898081 is a `hidden beast` number, since 7 + 7 + 39 + 7 + 589 + 8 + 0 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 707349963681 + 66625934400 = 841041^2 + 258120^2 .

It is not a de Polignac number, because 773975898081 - 2²³ = 773967509473 is a prime.

It is a super-2 number, since 2×773975898081² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (773975898083) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1892361405 + ... + 1892361813.

Almost surely, 2^773975898081 is an apocalyptic number.

773975898081 is the 879759-th square number.

773975898081 is the 439880-th centered octagonal number.

It is an amenable number.

773975898081 is a deficient number, since it is larger than the sum of its proper divisors (389913839490).

773975898081 is an frugal number, since it uses more digits than its factorization.

773975898081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 213373440, while the sum is 72.

The spelling of 773975898081 in words is "seven hundred seventy-three billion, nine hundred seventy-five million, eight hundred ninety-eight thousand, eighty-one".