121641652577 has 4 divisors (see below), whose sum is σ = 121655950020. Its totient is φ = 121627355136.

The previous prime is 121641652571. The next prime is 121641652589. The reversal of 121641652577 is 775256146121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120825064801 + 816587776 = 347599^2 + 28576^2 .

It is a cyclic number.

It is not a de Polignac number, because 121641652577 - 2¹⁸ = 121641390433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121641652571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7135952 + ... + 7152977.

It is an arithmetic number, because the mean of its divisors is an integer number (30413987505).

Almost surely, 2^121641652577 is an apocalyptic number.

It is an amenable number.

121641652577 is a deficient number, since it is larger than the sum of its proper divisors (14297443).

121641652577 is an equidigital number, since it uses as much as digits as its factorization.

121641652577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14297442.

The product of its digits is 705600, while the sum is 47.

Adding to 121641652577 its reverse (775256146121), we get a palindrome (896897798698).

The spelling of 121641652577 in words is "one hundred twenty-one billion, six hundred forty-one million, six hundred fifty-two thousand, five hundred seventy-seven".