122640698387515 has 32 divisors (see below), whose sum is σ = 183760811366400. Its totient is φ = 76335684163200.

The previous prime is 122640698387513. The next prime is 122640698387567. The reversal of 122640698387515 is 515783896046221.

It is not a de Polignac number, because 122640698387515 - 2¹ = 122640698387513 is a prime.

It is a super-2 number, since 2×122640698387515² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (122640698387513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 240704115 + ... + 241213084.

It is an arithmetic number, because the mean of its divisors is an integer number (5742525355200).

It is a 2-persistent number, because it is pandigital, and so is 2⋅122640698387515 = 245281396775030, but 3⋅122640698387515 = 367922095162545 is not.

Almost surely, 2^{122640698387515} is an apocalyptic number.

122640698387515 is a deficient number, since it is larger than the sum of its proper divisors (61120112978885).

122640698387515 is a wasteful number, since it uses less digits than its factorization.

122640698387515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481917883.

The product of its (nonzero) digits is 174182400, while the sum is 67.

The spelling of 122640698387515 in words is "one hundred twenty-two trillion, six hundred forty billion, six hundred ninety-eight million, three hundred eighty-seven thousand, five hundred fifteen".