121786947657 has 8 divisors (see below), whose sum is σ = 180425107680. Its totient is φ = 81191298420.

The previous prime is 121786947647. The next prime is 121786947791. The reversal of 121786947657 is 756749687121.

It is not a de Polignac number, because 121786947657 - 2⁴ = 121786947641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121786947594 and 121786947603.

It is not an unprimeable number, because it can be changed into a prime (121786947647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2255313819 + ... + 2255313872.

It is an arithmetic number, because the mean of its divisors is an integer number (22553138460).

Almost surely, 2^121786947657 is an apocalyptic number.

It is an amenable number.

121786947657 is a deficient number, since it is larger than the sum of its proper divisors (58638160023).

121786947657 is an equidigital number, since it uses as much as digits as its factorization.

121786947657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510627700 (or 4510627694 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 63.

The spelling of 121786947657 in words is "one hundred twenty-one billion, seven hundred eighty-six million, nine hundred forty-seven thousand, six hundred fifty-seven".