78979422667 has 4 divisors (see below), whose sum is σ = 81114001696. Its totient is φ = 76844843640.

The previous prime is 78979422659. The next prime is 78979422671. The reversal of 78979422667 is 76622497987.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78979422667 - 2³ = 78979422659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78979426667) 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, 1067289459 + ... + 1067289532.

It is an arithmetic number, because the mean of its divisors is an integer number (20278500424).

Almost surely, 2^78979422667 is an apocalyptic number.

78979422667 is a deficient number, since it is larger than the sum of its proper divisors (2134579029).

78979422667 is a wasteful number, since it uses less digits than its factorization.

78979422667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134579028.

The product of its digits is 128024064, while the sum is 67.

The spelling of 78979422667 in words is "seventy-eight billion, nine hundred seventy-nine million, four hundred twenty-two thousand, six hundred sixty-seven".