77521281841 has 4 divisors (see below), whose sum is σ = 80021968384. Its totient is φ = 75020595300.

The previous prime is 77521281839. The next prime is 77521281989. The reversal of 77521281841 is 14818212577.

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 77521281841 - 2¹ = 77521281839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77521281791 and 77521281800.

It is not an unprimeable number, because it can be changed into a prime (77521281641) 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, 1250343225 + ... + 1250343286.

It is an arithmetic number, because the mean of its divisors is an integer number (20005492096).

Almost surely, 2^77521281841 is an apocalyptic number.

It is an amenable number.

77521281841 is a deficient number, since it is larger than the sum of its proper divisors (2500686543).

77521281841 is a wasteful number, since it uses less digits than its factorization.

77521281841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500686542.

The product of its digits is 250880, while the sum is 46.

The spelling of 77521281841 in words is "seventy-seven billion, five hundred twenty-one million, two hundred eighty-one thousand, eight hundred forty-one".