122017665780 has 36 divisors (see below), whose sum is σ = 370120253412. Its totient is φ = 32538044160.

The previous prime is 122017665779. The next prime is 122017665811. The reversal of 122017665780 is 87566710221.

122017665780 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 1 + 76 + 6 + 578 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 46970159076 + 75047506704 = 216726^2 + 273948^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 338937781 + ... + 338938140.

Almost surely, 2^122017665780 is an apocalyptic number.

122017665780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122017665780 is an abundant number, since it is smaller than the sum of its proper divisors (248102587632).

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

122017665780 is a wasteful number, since it uses less digits than its factorization.

122017665780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677875936 (or 677875931 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

It can be divided in two parts, 1220176 and 65780, that added together give a square (1285956 = 1134²).

The spelling of 122017665780 in words is "one hundred twenty-two billion, seventeen million, six hundred sixty-five thousand, seven hundred eighty".