122716521887 has 4 divisors (see below), whose sum is σ = 126948126120. Its totient is φ = 118484917656.

The previous prime is 122716521883. The next prime is 122716521899. The reversal of 122716521887 is 788125617221.

It is a happy number.

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 122716521887 - 2² = 122716521883 is a prime.

It is a super-3 number, since 3×122716521887³ (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 (122716521883) 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, 2115802073 + ... + 2115802130.

It is an arithmetic number, because the mean of its divisors is an integer number (31737031530).

Almost surely, 2^122716521887 is an apocalyptic number.

122716521887 is a deficient number, since it is larger than the sum of its proper divisors (4231604233).

122716521887 is an equidigital number, since it uses as much as digits as its factorization.

122716521887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4231604232.

The product of its digits is 752640, while the sum is 50.

The spelling of 122716521887 in words is "one hundred twenty-two billion, seven hundred sixteen million, five hundred twenty-one thousand, eight hundred eighty-seven".