77420773445 has 4 divisors (see below), whose sum is σ = 92904928140. Its totient is φ = 61936618752.

The previous prime is 77420773433. The next prime is 77420773457. The reversal of 77420773445 is 54437702477.

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

It is an interprime number because it is at equal distance from previous prime (77420773433) and next prime (77420773457).

It can be written as a sum of positive squares in 2 ways, for example, as 51502671364 + 25918102081 = 226942^2 + 160991^2 .

It is a cyclic number.

It is not a de Polignac number, because 77420773445 - 2²⁶ = 77353664581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77420773393 and 77420773402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7742077340 + ... + 7742077349.

It is an arithmetic number, because the mean of its divisors is an integer number (23226232035).

Almost surely, 2^77420773445 is an apocalyptic number.

It is an amenable number.

77420773445 is a deficient number, since it is larger than the sum of its proper divisors (15484154695).

77420773445 is a wasteful number, since it uses less digits than its factorization.

77420773445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15484154694.

The product of its (nonzero) digits is 4609920, while the sum is 50.

The spelling of 77420773445 in words is "seventy-seven billion, four hundred twenty million, seven hundred seventy-three thousand, four hundred forty-five".