121653522505 has 8 divisors (see below), whose sum is σ = 145999569024. Its totient is φ = 97312590000.

The previous prime is 121653522461. The next prime is 121653522577. The reversal of 121653522505 is 505225356121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-121653522505 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 1225971 + ... + 1321480.

It is an arithmetic number, because the mean of its divisors is an integer number (18249946128).

Almost surely, 2^121653522505 is an apocalyptic number.

It is an amenable number.

121653522505 is a deficient number, since it is larger than the sum of its proper divisors (24346046519).

121653522505 is an equidigital number, since it uses as much as digits as its factorization.

121653522505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2557007.

The product of its (nonzero) digits is 90000, while the sum is 37.

Adding to 121653522505 its reverse (505225356121), we get a palindrome (626878878626).

The spelling of 121653522505 in words is "one hundred twenty-one billion, six hundred fifty-three million, five hundred twenty-two thousand, five hundred five".