121755415647 has 16 divisors (see below), whose sum is σ = 165006720000. Its totient is φ = 79844834784.

The previous prime is 121755415637. The next prime is 121755415669. The reversal of 121755415647 is 746514557121.

It is not a de Polignac number, because 121755415647 - 2⁴ = 121755415631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121755415596 and 121755415605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121755415627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 891147 + ... + 1018652.

It is an arithmetic number, because the mean of its divisors is an integer number (10312920000).

Almost surely, 2^121755415647 is an apocalyptic number.

121755415647 is a deficient number, since it is larger than the sum of its proper divisors (43251304353).

121755415647 is a wasteful number, since it uses less digits than its factorization.

121755415647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910150.

The product of its digits is 1176000, while the sum is 48.

The spelling of 121755415647 in words is "one hundred twenty-one billion, seven hundred fifty-five million, four hundred fifteen thousand, six hundred forty-seven".