122788653991 has 4 divisors (see below), whose sum is σ = 125401178592. Its totient is φ = 120176129392.

The previous prime is 122788653989. The next prime is 122788653997. The reversal of 122788653991 is 199356887221.

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 122788653991 - 2¹ = 122788653989 is a prime.

It is a super-3 number, since 3×122788653991³ (a number of 34 digits) contains 333 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 (122788653997) 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, 1306262230 + ... + 1306262323.

It is an arithmetic number, because the mean of its divisors is an integer number (31350294648).

Almost surely, 2^122788653991 is an apocalyptic number.

122788653991 is a deficient number, since it is larger than the sum of its proper divisors (2612524601).

122788653991 is an equidigital number, since it uses as much as digits as its factorization.

122788653991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612524600.

The product of its digits is 13063680, while the sum is 61.

The spelling of 122788653991 in words is "one hundred twenty-two billion, seven hundred eighty-eight million, six hundred fifty-three thousand, nine hundred ninety-one".