121765497546 has 144 divisors (see below), whose sum is σ = 311844738240. Its totient is φ = 31580841600.

The previous prime is 121765497527. The next prime is 121765497631. The reversal of 121765497546 is 645794567121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 28777251 + ... + 28781481.

It is an arithmetic number, because the mean of its divisors is an integer number (2165588460).

Almost surely, 2^121765497546 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121765497546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155922369120).

121765497546 is an abundant number, since it is smaller than the sum of its proper divisors (190079240694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121765497546 is a wasteful number, since it uses less digits than its factorization.

121765497546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5081 (or 5063 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 57.

The spelling of 121765497546 in words is "one hundred twenty-one billion, seven hundred sixty-five million, four hundred ninety-seven thousand, five hundred forty-six".