77873925481 has 27 divisors (see below), whose sum is σ = 89561573437. Its totient is φ = 67655063960.

The previous prime is 77873925463. The next prime is 77873925509. The reversal of 77873925481 is 18452937877.

The square root of 77873925481 is 279059.

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

It is not a de Polignac number, because 77873925481 - 2⁵ = 77873925449 is a prime.

It is a super-2 number, since 2×77873925481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77873925401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 70601376 + ... + 70602478.

Almost surely, 2^77873925481 is an apocalyptic number.

77873925481 is the 279059-th square number.

77873925481 is the 139530-th centered octagonal number.

It is an amenable number.

77873925481 is a deficient number, since it is larger than the sum of its proper divisors (11687647956).

77873925481 is an equidigital number, since it uses as much as digits as its factorization.

77873925481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2274 (or 1137 counting only the distinct ones).

The product of its digits is 23708160, while the sum is 61.

The spelling of 77873925481 in words is "seventy-seven billion, eight hundred seventy-three million, nine hundred twenty-five thousand, four hundred eighty-one".