121670331665 has 16 divisors (see below), whose sum is σ = 149629530960. Its totient is φ = 94921543680.

The previous prime is 121670331659. The next prime is 121670331689. The reversal of 121670331665 is 566133076121.

It can be written as a sum of positive squares in 8 ways, for example, as 60303151489 + 61367180176 = 245567^2 + 247724^2 .

It is not a de Polignac number, because 121670331665 - 2²⁰ = 121669283089 is a prime.

It is a super-2 number, since 2×121670331665² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Curzon 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, 357281 + ... + 609089.

It is an arithmetic number, because the mean of its divisors is an integer number (9351845685).

Almost surely, 2^121670331665 is an apocalyptic number.

It is an amenable number.

121670331665 is a deficient number, since it is larger than the sum of its proper divisors (27959199295).

121670331665 is a wasteful number, since it uses less digits than its factorization.

121670331665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254212.

The product of its (nonzero) digits is 136080, while the sum is 41.

The spelling of 121670331665 in words is "one hundred twenty-one billion, six hundred seventy million, three hundred thirty-one thousand, six hundred sixty-five".