121777696978 has 12 divisors (see below), whose sum is σ = 212489655102. Its totient is φ = 52190441520.

The previous prime is 121777696897. The next prime is 121777697009. The reversal of 121777696978 is 879696777121.

It can be written as a sum of positive squares in only one way, i.e., 118712635209 + 3065061769 = 344547^2 + 55363^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 621314683 + ... + 621314878.

Almost surely, 2^121777696978 is an apocalyptic number.

121777696978 is a deficient number, since it is larger than the sum of its proper divisors (90711958124).

121777696978 is a wasteful number, since it uses less digits than its factorization.

121777696978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242629577 (or 1242629570 counting only the distinct ones).

The product of its digits is 112021056, while the sum is 70.

The spelling of 121777696978 in words is "one hundred twenty-one billion, seven hundred seventy-seven million, six hundred ninety-six thousand, nine hundred seventy-eight".