42990165121 has 4 divisors (see below), whose sum is σ = 42992445700. Its totient is φ = 42987884544.

The previous prime is 42990165079. The next prime is 42990165137. The reversal of 42990165121 is 12156109924.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24504771600 + 18485393521 = 156540^2 + 135961^2 .

It is a cyclic number.

It is not a de Polignac number, because 42990165121 - 2⁷ = 42990164993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42990165221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1111776 + ... + 1149793.

It is an arithmetic number, because the mean of its divisors is an integer number (10748111425).

Almost surely, 2^42990165121 is an apocalyptic number.

It is an amenable number.

42990165121 is a deficient number, since it is larger than the sum of its proper divisors (2280579).

42990165121 is a wasteful number, since it uses less digits than its factorization.

42990165121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280578.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 42990165121 in words is "forty-two billion, nine hundred ninety million, one hundred sixty-five thousand, one hundred twenty-one".