121637045647 has 4 divisors (see below), whose sum is σ = 130993741480. Its totient is φ = 112280349816.

The previous prime is 121637045587. The next prime is 121637045659. The reversal of 121637045647 is 746540736121.

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

It is a cyclic number.

It is not a de Polignac number, because 121637045647 - 2¹⁹ = 121636521359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121637045597 and 121637045606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121634045647) 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, 4678347897 + ... + 4678347922.

It is an arithmetic number, because the mean of its divisors is an integer number (32748435370).

Almost surely, 2^121637045647 is an apocalyptic number.

121637045647 is a deficient number, since it is larger than the sum of its proper divisors (9356695833).

121637045647 is an equidigital number, since it uses as much as digits as its factorization.

121637045647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9356695832.

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 121637045647 in words is "one hundred twenty-one billion, six hundred thirty-seven million, forty-five thousand, six hundred forty-seven".