78694169477 has 24 divisors (see below), whose sum is σ = 99401842176. Its totient is φ = 60981228000.

The previous prime is 78694169459. The next prime is 78694169563. The reversal of 78694169477 is 77496149687.

It is a happy number.

It is not a de Polignac number, because 78694169477 - 2¹⁶ = 78694103941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78694160477) 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 23 ways as a sum of consecutive naturals, for example, 103349 + ... + 409962.

It is an arithmetic number, because the mean of its divisors is an integer number (4141743424).

Almost surely, 2^78694169477 is an apocalyptic number.

78694169477 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

78694169477 is a deficient number, since it is larger than the sum of its proper divisors (20707672699).

78694169477 is a wasteful number, since it uses less digits than its factorization.

78694169477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513521 (or 513510 counting only the distinct ones).

The product of its digits is 128024064, while the sum is 68.

The spelling of 78694169477 in words is "seventy-eight billion, six hundred ninety-four million, one hundred sixty-nine thousand, four hundred seventy-seven".