16642124251 has 8 divisors (see below), whose sum is σ = 16845580400. Its totient is φ = 16439591520.

The previous prime is 16642124209. The next prime is 16642124273. The reversal of 16642124251 is 15242124661.

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 16642124251 - 2²¹ = 16640027099 is a prime.

It is a super-2 number, since 2×16642124251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16642124201) 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, 194556 + ... + 266713.

It is an arithmetic number, because the mean of its divisors is an integer number (2105697550).

Almost surely, 2^16642124251 is an apocalyptic number.

16642124251 is a deficient number, since it is larger than the sum of its proper divisors (203456149).

16642124251 is a wasteful number, since it uses less digits than its factorization.

16642124251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461709.

The product of its digits is 23040, while the sum is 34.

The spelling of 16642124251 in words is "sixteen billion, six hundred forty-two million, one hundred twenty-four thousand, two hundred fifty-one".