78545623077 has 16 divisors (see below), whose sum is σ = 116435471680. Its totient is φ = 52331535216.

The previous prime is 78545623061. The next prime is 78545623081. The reversal of 78545623077 is 77032654587.

It is a happy number.

78545623077 is a `hidden beast` number, since 7 + 8 + 5 + 4 + 5 + 623 + 0 + 7 + 7 = 666.

It is not a de Polignac number, because 78545623077 - 2⁴ = 78545623061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78545623007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 850078 + ... + 937935.

It is an arithmetic number, because the mean of its divisors is an integer number (7277216980).

Almost surely, 2^78545623077 is an apocalyptic number.

It is an amenable number.

78545623077 is a deficient number, since it is larger than the sum of its proper divisors (37889848603).

78545623077 is a wasteful number, since it uses less digits than its factorization.

78545623077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789649 (or 1789643 counting only the distinct ones).

The product of its (nonzero) digits is 9878400, while the sum is 54.

The spelling of 78545623077 in words is "seventy-eight billion, five hundred forty-five million, six hundred twenty-three thousand, seventy-seven".