16661715620453 has 4 divisors (see below), whose sum is σ = 16677568823808. Its totient is φ = 16645862417100.

The previous prime is 16661715620447. The next prime is 16661715620477. The reversal of 16661715620453 is 35402651716661.

16661715620453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16661715620453 - 2³⁸ = 16386837713509 is a prime.

It is a super-2 number, since 2×16661715620453² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16661715620395 and 16661715620404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661715620413) 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, 7926600101 + ... + 7926602202.

It is an arithmetic number, because the mean of its divisors is an integer number (4169392205952).

Almost surely, 2^{16661715620453} is an apocalyptic number.

It is an amenable number.

16661715620453 is a deficient number, since it is larger than the sum of its proper divisors (15853203355).

16661715620453 is a wasteful number, since it uses less digits than its factorization.

16661715620453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15853203354.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 16661715620453 in words is "sixteen trillion, six hundred sixty-one billion, seven hundred fifteen million, six hundred twenty thousand, four hundred fifty-three".