671521162013447 has 4 divisors (see below), whose sum is σ = 672990573746976. Its totient is φ = 670051750279920.

The previous prime is 671521162013417. The next prime is 671521162013461. The reversal of 671521162013447 is 744310261125176.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671521162013447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 671521162013395 and 671521162013404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671521162013417) 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, 734705866079 + ... + 734705866992.

It is an arithmetic number, because the mean of its divisors is an integer number (168247643436744).

Almost surely, 2^{671521162013447} is an apocalyptic number.

671521162013447 is a deficient number, since it is larger than the sum of its proper divisors (1469411733529).

671521162013447 is a wasteful number, since it uses less digits than its factorization.

671521162013447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469411733528.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 671521162013447 in words is "six hundred seventy-one trillion, five hundred twenty-one billion, one hundred sixty-two million, thirteen thousand, four hundred forty-seven".