671437745541 has 12 divisors (see below), whose sum is σ = 1026904787532. Its totient is φ = 421294271616.

The previous prime is 671437745501. The next prime is 671437745549. The reversal of 671437745541 is 145547734176.

671437745541 is a `hidden beast` number, since 6 + 7 + 14 + 3 + 7 + 74 + 554 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 533849422500 + 137588323041 = 730650^2 + 370929^2 .

It is not a de Polignac number, because 671437745541 - 2⁶ = 671437745477 is a prime.

It is a super-2 number, since 2×671437745541² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671437745549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2194240846 + ... + 2194241151.

It is an arithmetic number, because the mean of its divisors is an integer number (85575398961).

Almost surely, 2^671437745541 is an apocalyptic number.

It is an amenable number.

671437745541 is a deficient number, since it is larger than the sum of its proper divisors (355467041991).

671437745541 is a wasteful number, since it uses less digits than its factorization.

671437745541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4388482020 (or 4388482017 counting only the distinct ones).

The product of its digits is 9878400, while the sum is 54.

The spelling of 671437745541 in words is "six hundred seventy-one billion, four hundred thirty-seven million, seven hundred forty-five thousand, five hundred forty-one".