121561670165 has 64 divisors (see below), whose sum is σ = 164719457280. Its totient is φ = 85526461440.

The previous prime is 121561670099. The next prime is 121561670183. The reversal of 121561670165 is 561076165121.

It is not a de Polignac number, because 121561670165 - 2¹⁴ = 121561653781 is a prime.

It is a super-2 number, since 2×121561670165² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35060762 + ... + 35064228.

It is an arithmetic number, because the mean of its divisors is an integer number (2573741520).

Almost surely, 2^121561670165 is an apocalyptic number.

It is an amenable number.

121561670165 is a deficient number, since it is larger than the sum of its proper divisors (43157787115).

121561670165 is a wasteful number, since it uses less digits than its factorization.

121561670165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822.

The product of its (nonzero) digits is 75600, while the sum is 41.

The spelling of 121561670165 in words is "one hundred twenty-one billion, five hundred sixty-one million, six hundred seventy thousand, one hundred sixty-five".