77472613381 has 4 divisors (see below), whose sum is σ = 77476876012. Its totient is φ = 77468350752.

The previous prime is 77472613331. The next prime is 77472613397. The reversal of 77472613381 is 18331627477.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 815616481 + 76656996900 = 28559^2 + 276870^2 .

It is a cyclic number.

It is not a de Polignac number, because 77472613381 - 2²⁹ = 76935742469 is a prime.

It is a super-2 number, since 2×77472613381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77472613331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2103936 + ... + 2140441.

It is an arithmetic number, because the mean of its divisors is an integer number (19369219003).

Almost surely, 2^77472613381 is an apocalyptic number.

It is an amenable number.

77472613381 is a deficient number, since it is larger than the sum of its proper divisors (4262631).

77472613381 is a wasteful number, since it uses less digits than its factorization.

77472613381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4262630.

The product of its digits is 1185408, while the sum is 49.

The spelling of 77472613381 in words is "seventy-seven billion, four hundred seventy-two million, six hundred thirteen thousand, three hundred eighty-one".