121777045155 has 24 divisors (see below), whose sum is σ = 211221708048. Its totient is φ = 64904220096.

The previous prime is 121777045147. The next prime is 121777045177. The reversal of 121777045155 is 551540777121.

121777045155 is a `hidden beast` number, since 12 + 1 + 77 + 70 + 451 + 55 = 666.

It is not a de Polignac number, because 121777045155 - 2³ = 121777045147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 121777045155.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 839097 + ... + 973466.

It is an arithmetic number, because the mean of its divisors is an integer number (8800904502).

Almost surely, 2^121777045155 is an apocalyptic number.

121777045155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121777045155 is a deficient number, since it is larger than the sum of its proper divisors (89444662893).

121777045155 is a wasteful number, since it uses less digits than its factorization.

121777045155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814067 (or 1814064 counting only the distinct ones).

The product of its (nonzero) digits is 343000, while the sum is 45.

The spelling of 121777045155 in words is "one hundred twenty-one billion, seven hundred seventy-seven million, forty-five thousand, one hundred fifty-five".