16556070506421 has 8 divisors (see below), whose sum is σ = 22074817429600. Its totient is φ = 11037351960432.

The previous prime is 16556070506401. The next prime is 16556070506473. The reversal of 16556070506421 is 12460507065561.

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

It is not a de Polignac number, because 16556070506421 - 2⁵ = 16556070506389 is a prime.

It is a super-2 number, since 2×16556070506421² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16556070506401) 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, 5693446 + ... + 8094903.

It is an arithmetic number, because the mean of its divisors is an integer number (2759352178700).

Almost surely, 2^{16556070506421} is an apocalyptic number.

It is an amenable number.

16556070506421 is a deficient number, since it is larger than the sum of its proper divisors (5518746923179).

16556070506421 is a wasteful number, since it uses less digits than its factorization.

16556070506421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14188595.

The product of its (nonzero) digits is 1512000, while the sum is 48.

The spelling of 16556070506421 in words is "sixteen trillion, five hundred fifty-six billion, seventy million, five hundred six thousand, four hundred twenty-one".