122553515906 has 4 divisors (see below), whose sum is σ = 183830273862. Its totient is φ = 61276757952.

The previous prime is 122553515879. The next prime is 122553515911. The reversal of 122553515906 is 609515355221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 609515355221 = 1123 ⋅542756327.

It can be written as a sum of positive squares in only one way, i.e., 103603515625 + 18950000281 = 321875^2 + 137659^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30638378975 + ... + 30638378978.

Almost surely, 2^122553515906 is an apocalyptic number.

122553515906 is a deficient number, since it is larger than the sum of its proper divisors (61276757956).

122553515906 is an equidigital number, since it uses as much as digits as its factorization.

122553515906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61276757955.

The product of its (nonzero) digits is 405000, while the sum is 44.

The spelling of 122553515906 in words is "one hundred twenty-two billion, five hundred fifty-three million, five hundred fifteen thousand, nine hundred six".