122776972578 has 54 divisors (see below), whose sum is σ = 288099014931. Its totient is φ = 37771583616.

The previous prime is 122776972529. The next prime is 122776972639. The reversal of 122776972578 is 875279677221.

122776972578 is a `hidden beast` number, since 1 + 227 + 76 + 97 + 257 + 8 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 14748402249 + 108028570329 = 121443^2 + 328677^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=247767.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19322650 + ... + 19329002.

Almost surely, 2^122776972578 is an apocalyptic number.

122776972578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 122776972578

122776972578 is an abundant number, since it is smaller than the sum of its proper divisors (165322042353).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

122776972578 is an frugal number, since it uses more digits than its factorization.

122776972578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12740 (or 6371 counting only the distinct ones).

The product of its digits is 41489280, while the sum is 63.

The spelling of 122776972578 in words is "one hundred twenty-two billion, seven hundred seventy-six million, nine hundred seventy-two thousand, five hundred seventy-eight".