16442741640657 has 4 divisors (see below), whose sum is σ = 21923655520880. Its totient is φ = 10961827760436.

The previous prime is 16442741640623. The next prime is 16442741640673. The reversal of 16442741640657 is 75604614724461.

It is a happy number.

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 not a de Polignac number, because 16442741640657 - 2²² = 16442737446353 is a prime.

It is a super-3 number, since 3×16442741640657³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16442741640597 and 16442741640606.

It is not an unprimeable number, because it can be changed into a prime (16442741640257) 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, 2740456940107 + ... + 2740456940112.

It is an arithmetic number, because the mean of its divisors is an integer number (5480913880220).

Almost surely, 2^{16442741640657} is an apocalyptic number.

It is an amenable number.

16442741640657 is a deficient number, since it is larger than the sum of its proper divisors (5480913880223).

16442741640657 is an equidigital number, since it uses as much as digits as its factorization.

16442741640657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5480913880222.

The product of its (nonzero) digits is 27095040, while the sum is 57.

The spelling of 16442741640657 in words is "sixteen trillion, four hundred forty-two billion, seven hundred forty-one million, six hundred forty thousand, six hundred fifty-seven".