122078792978 has 4 divisors (see below), whose sum is σ = 183118189470. Its totient is φ = 61039396488.

The previous prime is 122078792933. The next prime is 122078792987. The reversal of 122078792978 is 879297870221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879297870221 = 143981 ⋅6107041.

It can be written as a sum of positive squares in only one way, i.e., 75406807609 + 46671985369 = 274603^2 + 216037^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 122078792978.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30519698243 + ... + 30519698246.

Almost surely, 2^122078792978 is an apocalyptic number.

122078792978 is a deficient number, since it is larger than the sum of its proper divisors (61039396492).

122078792978 is an equidigital number, since it uses as much as digits as its factorization.

122078792978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61039396491.

The product of its (nonzero) digits is 14224896, while the sum is 62.

The spelling of 122078792978 in words is "one hundred twenty-two billion, seventy-eight million, seven hundred ninety-two thousand, nine hundred seventy-eight".