121777715493 has 256 divisors, whose sum is σ = 239099904000. Its totient is φ = 59570380800.

The previous prime is 121777715483. The next prime is 121777715519. The reversal of 121777715493 is 394517777121.

121777715493 is a `hidden beast` number, since 1 + 2 + 1 + 77 + 77 + 15 + 493 = 666.

It is not a de Polignac number, because 121777715493 - 2¹⁰ = 121777714469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121777715413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 433372513 + ... + 433372793.

It is an arithmetic number, because the mean of its divisors is an integer number (933984000).

Almost surely, 2^121777715493 is an apocalyptic number.

It is an amenable number.

121777715493 is a deficient number, since it is larger than the sum of its proper divisors (117322188507).

121777715493 is a wasteful number, since it uses less digits than its factorization.

121777715493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593 (or 587 counting only the distinct ones).

The product of its digits is 2593080, while the sum is 54.

The spelling of 121777715493 in words is "one hundred twenty-one billion, seven hundred seventy-seven million, seven hundred fifteen thousand, four hundred ninety-three".