16121612285 has 8 divisors (see below), whose sum is σ = 20013036120. Its totient is φ = 12452555584.

The previous prime is 16121612237. The next prime is 16121612321. The reversal of 16121612285 is 58221612161.

It can be written as a sum of positive squares in 4 ways, for example, as 877759129 + 15243853156 = 29627^2 + 123466^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16121612285 - 2²⁴ = 16104835069 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 55591622 + ... + 55591911.

It is an arithmetic number, because the mean of its divisors is an integer number (2501629515).

Almost surely, 2^16121612285 is an apocalyptic number.

It is an amenable number.

16121612285 is a deficient number, since it is larger than the sum of its proper divisors (3891423835).

16121612285 is a wasteful number, since it uses less digits than its factorization.

16121612285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111183567.

The product of its digits is 11520, while the sum is 35.

The spelling of 16121612285 in words is "sixteen billion, one hundred twenty-one million, six hundred twelve thousand, two hundred eighty-five".