16423870549 has 8 divisors (see below), whose sum is σ = 16510201400. Its totient is φ = 16337764800.

The previous prime is 16423870457. The next prime is 16423870571. The reversal of 16423870549 is 94507832461.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3830991025 + 12592879524 = 61895^2 + 112218^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16423870549 is a prime.

It is a super-2 number, since 2×16423870549² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16423870049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91039 + ... + 202819.

It is an arithmetic number, because the mean of its divisors is an integer number (2063775175).

It is a 1-persistent number, because it is pandigital, but 2⋅16423870549 = 32847741098 is not.

Almost surely, 2^16423870549 is an apocalyptic number.

It is an amenable number.

16423870549 is a deficient number, since it is larger than the sum of its proper divisors (86330851).

16423870549 is a wasteful number, since it uses less digits than its factorization.

16423870549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112551.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 16423870549 in words is "sixteen billion, four hundred twenty-three million, eight hundred seventy thousand, five hundred forty-nine".