121542485805 has 48 divisors (see below), whose sum is σ = 226913384880. Its totient is φ = 59827313664.

The previous prime is 121542485789. The next prime is 121542485833. The reversal of 121542485805 is 508584245121.

121542485805 is a `hidden beast` number, since 1 + 21 + 5 + 4 + 2 + 48 + 580 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 8612211204 + 112930274601 = 92802^2 + 336051^2 .

It is not a de Polignac number, because 121542485805 - 2⁴ = 121542485789 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5622177 + ... + 5643753.

It is an arithmetic number, because the mean of its divisors is an integer number (4727362185).

Almost surely, 2^121542485805 is an apocalyptic number.

121542485805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121542485805 is a deficient number, since it is larger than the sum of its proper divisors (105370899075).

121542485805 is a wasteful number, since it uses less digits than its factorization.

121542485805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31230 (or 31227 counting only the distinct ones).

The product of its (nonzero) digits is 512000, while the sum is 45.

The spelling of 121542485805 in words is "one hundred twenty-one billion, five hundred forty-two million, four hundred eighty-five thousand, eight hundred five".