121644785125 has 16 divisors (see below), whose sum is σ = 154677090672. Its totient is φ = 95479675200.

The previous prime is 121644785051. The next prime is 121644785209. The reversal of 121644785125 is 521587446121.

It can be written as a sum of positive squares in 8 ways, for example, as 24102252001 + 97542533124 = 155249^2 + 312318^2 .

It is not a de Polignac number, because 121644785125 - 2¹¹ = 121644783077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9174114 + ... + 9187363.

It is an arithmetic number, because the mean of its divisors is an integer number (9667318167).

Almost surely, 2^121644785125 is an apocalyptic number.

It is an amenable number.

121644785125 is a deficient number, since it is larger than the sum of its proper divisors (33032305547).

121644785125 is an equidigital number, since it uses as much as digits as its factorization.

121644785125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18361545 (or 18361535 counting only the distinct ones).

The product of its digits is 537600, while the sum is 46.

The spelling of 121644785125 in words is "one hundred twenty-one billion, six hundred forty-four million, seven hundred eighty-five thousand, one hundred twenty-five".