121455025545 has 32 divisors (see below), whose sum is σ = 225853424640. Its totient is φ = 54581238720.

The previous prime is 121455025537. The next prime is 121455025567. The reversal of 121455025545 is 545520554121.

It is a happy number.

It is not a de Polignac number, because 121455025545 - 2³ = 121455025537 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 9796471 + ... + 9808860.

It is an arithmetic number, because the mean of its divisors is an integer number (7057919520).

Almost surely, 2^121455025545 is an apocalyptic number.

121455025545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121455025545 is a deficient number, since it is larger than the sum of its proper divisors (104398399095).

121455025545 is a wasteful number, since it uses less digits than its factorization.

121455025545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19605405.

The product of its (nonzero) digits is 200000, while the sum is 39.

Adding to 121455025545 its reverse (545520554121), we get a palindrome (666975579666).

The spelling of 121455025545 in words is "one hundred twenty-one billion, four hundred fifty-five million, twenty-five thousand, five hundred forty-five".