122615551639 has 4 divisors (see below), whose sum is σ = 140132059024. Its totient is φ = 105099044256.

The previous prime is 122615551631. The next prime is 122615551661. The reversal of 122615551639 is 936155516221.

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 122615551639 - 2³ = 122615551631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122615551631) 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, 8758253682 + ... + 8758253695.

It is an arithmetic number, because the mean of its divisors is an integer number (35033014756).

Almost surely, 2^122615551639 is an apocalyptic number.

122615551639 is a deficient number, since it is larger than the sum of its proper divisors (17516507385).

122615551639 is an equidigital number, since it uses as much as digits as its factorization.

122615551639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17516507384.

The product of its digits is 486000, while the sum is 46.

The spelling of 122615551639 in words is "one hundred twenty-two billion, six hundred fifteen million, five hundred fifty-one thousand, six hundred thirty-nine".