121953437586 has 12 divisors (see below), whose sum is σ = 264232448142. Its totient is φ = 40651145856.

The previous prime is 121953437581. The next prime is 121953437611. The reversal of 121953437586 is 685734359121.

It is a happy number.

121953437586 is a `hidden beast` number, since 1 + 2 + 1 + 9 + 53 + 4 + 3 + 7 + 586 = 666.

It can be written as a sum of positive squares in only one way, i.e., 112462976025 + 9490461561 = 335355^2 + 97419^2 .

It is not an unprimeable number, because it can be changed into a prime (121953437581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3387595471 + ... + 3387595506.

Almost surely, 2^121953437586 is an apocalyptic number.

121953437586 is an abundant number, since it is smaller than the sum of its proper divisors (142279010556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121953437586 is a wasteful number, since it uses less digits than its factorization.

121953437586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6775190985 (or 6775190982 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 121953437586 in words is "one hundred twenty-one billion, nine hundred fifty-three million, four hundred thirty-seven thousand, five hundred eighty-six".