121615641472 has 32 divisors (see below), whose sum is σ = 260918176680. Its totient is φ = 56130295296.

The previous prime is 121615641431. The next prime is 121615641517. The reversal of 121615641472 is 274146516121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 36541498 + ... + 36544825.

Almost surely, 2^121615641472 is an apocalyptic number.

It is an amenable number.

121615641472 is an abundant number, since it is smaller than the sum of its proper divisors (139302535208).

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

121615641472 is an equidigital number, since it uses as much as digits as its factorization.

121615641472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73086350 (or 73086338 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The spelling of 121615641472 in words is "one hundred twenty-one billion, six hundred fifteen million, six hundred forty-one thousand, four hundred seventy-two".