121751671661 has 12 divisors (see below), whose sum is σ = 128827883520. Its totient is φ = 114745386240.

The previous prime is 121751671651. The next prime is 121751671693. The reversal of 121751671661 is 166176157121.

It is not a de Polignac number, because 121751671661 - 2¹⁰ = 121751670637 is a prime.

It is a super-3 number, since 3×121751671661³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121751671651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 621716 + ... + 793746.

It is an arithmetic number, because the mean of its divisors is an integer number (10735656960).

Almost surely, 2^121751671661 is an apocalyptic number.

It is an amenable number.

121751671661 is a deficient number, since it is larger than the sum of its proper divisors (7076211859).

121751671661 is an equidigital number, since it uses as much as digits as its factorization.

121751671661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172436 (or 172243 counting only the distinct ones).

The product of its digits is 105840, while the sum is 44.

The spelling of 121751671661 in words is "one hundred twenty-one billion, seven hundred fifty-one million, six hundred seventy-one thousand, six hundred sixty-one".