78796021669 has 4 divisors (see below), whose sum is σ = 80131547520. Its totient is φ = 77460495820.

The previous prime is 78796021583. The next prime is 78796021709. The reversal of 78796021669 is 96612069787.

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 78796021669 - 2¹⁹ = 78795497381 is a prime.

It is a super-2 number, since 2×78796021669² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78796024669) 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, 667762837 + ... + 667762954.

It is an arithmetic number, because the mean of its divisors is an integer number (20032886880).

Almost surely, 2^78796021669 is an apocalyptic number.

It is an amenable number.

78796021669 is a deficient number, since it is larger than the sum of its proper divisors (1335525851).

78796021669 is a wasteful number, since it uses less digits than its factorization.

78796021669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335525850.

The product of its (nonzero) digits is 13716864, while the sum is 61.

The spelling of 78796021669 in words is "seventy-eight billion, seven hundred ninety-six million, twenty-one thousand, six hundred sixty-nine".