121953437604 has 18 divisors (see below), whose sum is σ = 308271189590. Its totient is φ = 40651145856.

The previous prime is 121953437581. The next prime is 121953437611. The reversal of 121953437604 is 406734359121.

121953437604 is a `hidden beast` number, since 1 + 2 + 1 + 9 + 5 + 3 + 4 + 37 + 604 = 666.

It can be written as a sum of positive squares in only one way, i.e., 120199503204 + 1753934400 = 346698^2 + 41880^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 121953437604.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1693797709 + ... + 1693797780.

Almost surely, 2^121953437604 is an apocalyptic number.

It is an amenable number.

121953437604 is an abundant number, since it is smaller than the sum of its proper divisors (186317751986).

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

121953437604 is a wasteful number, since it uses less digits than its factorization.

121953437604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387595499 (or 3387595494 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 121953437604 in words is "one hundred twenty-one billion, nine hundred fifty-three million, four hundred thirty-seven thousand, six hundred four".