121266550557 has 12 divisors (see below), whose sum is σ = 175172961600. Its totient is φ = 80839674888.

The previous prime is 121266550547. The next prime is 121266550567. The reversal of 121266550557 is 755055662121.

121266550557 is a `hidden beast` number, since 1 + 21 + 26 + 6 + 5 + 50 + 557 = 666.

It is an interprime number because it is at equal distance from previous prime (121266550547) and next prime (121266550567).

It is not a de Polignac number, because 121266550557 - 2²³ = 121258161949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121266550507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 223557 + ... + 540842.

It is an arithmetic number, because the mean of its divisors is an integer number (14597746800).

Almost surely, 2^121266550557 is an apocalyptic number.

It is an amenable number.

121266550557 is a deficient number, since it is larger than the sum of its proper divisors (53906411043).

121266550557 is a wasteful number, since it uses less digits than its factorization.

121266550557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782032 (or 782029 counting only the distinct ones).

The product of its (nonzero) digits is 630000, while the sum is 45.

The spelling of 121266550557 in words is "one hundred twenty-one billion, two hundred sixty-six million, five hundred fifty thousand, five hundred fifty-seven".