121651673796 has 81 divisors (see below), whose sum is σ = 319467802381. Its totient is φ = 40531723488.

The previous prime is 121651673791. The next prime is 121651673797. The reversal of 121651673796 is 697376156121.

The square root of 121651673796 is 348786.

It is a perfect power (a square), and thus also a powerful number.

121651673796 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 516 + 7 + 37 + 96 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8981352900 + 112670320896 = 94770^2 + 335664^2 .

It is a tau number, because it is divible by the number of its divisors (81).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121651673791) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 56502256 + ... + 56504408.

Almost surely, 2^121651673796 is an apocalyptic number.

121651673796 is the 348786-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121651673796

121651673796 is an abundant number, since it is smaller than the sum of its proper divisors (197816128585).

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

121651673796 is an frugal number, since it uses more digits than its factorization.

121651673796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4334 (or 2158 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The spelling of 121651673796 in words is "one hundred twenty-one billion, six hundred fifty-one million, six hundred seventy-three thousand, seven hundred ninety-six".