78040881677 has 8 divisors (see below), whose sum is σ = 86946901632. Its totient is φ = 69436760800.

The previous prime is 78040881673. The next prime is 78040881691. The reversal of 78040881677 is 77618804087.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78040881677 - 2² = 78040881673 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 (78040881673) 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 7 ways as a sum of consecutive naturals, for example, 75474224 + ... + 75475257.

It is an arithmetic number, because the mean of its divisors is an integer number (10868362704).

Almost surely, 2^78040881677 is an apocalyptic number.

It is an amenable number.

78040881677 is a deficient number, since it is larger than the sum of its proper divisors (8906019955).

78040881677 is a wasteful number, since it uses less digits than its factorization.

78040881677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150949539.

The product of its (nonzero) digits is 4214784, while the sum is 56.

The spelling of 78040881677 in words is "seventy-eight billion, forty million, eight hundred eighty-one thousand, six hundred seventy-seven".