122390505680 has 20 divisors (see below), whose sum is σ = 284557925892. Its totient is φ = 48956202240.

The previous prime is 122390505661. The next prime is 122390505689. The reversal of 122390505680 is 86505093221.

It can be written as a sum of positive squares in 2 ways, for example, as 31287949456 + 91102556224 = 176884^2 + 301832^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×122390505680² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122390505689) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 764940581 + ... + 764940740.

Almost surely, 2^122390505680 is an apocalyptic number.

122390505680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122390505680 is an abundant number, since it is smaller than the sum of its proper divisors (162167420212).

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

122390505680 is a wasteful number, since it uses less digits than its factorization.

122390505680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529881334 (or 1529881328 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 122390505680 in words is "one hundred twenty-two billion, three hundred ninety million, five hundred five thousand, six hundred eighty".