671685545 has 16 divisors (see below), whose sum is σ = 815531328. Its totient is φ = 531034560.

The previous prime is 671685541. The next prime is 671685569. The reversal of 671685545 is 545586176.

It is not a de Polignac number, because 671685545 - 2² = 671685541 is a prime.

It is a super-2 number, since 2×671685545² = 902322942723894050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671685545.

It is not an unprimeable number, because it can be changed into a prime (671685541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261407 + ... + 263963.

It is an arithmetic number, because the mean of its divisors is an integer number (50970708).

Almost surely, 2^671685545 is an apocalyptic number.

It is an amenable number.

671685545 is a deficient number, since it is larger than the sum of its proper divisors (143845783).

671685545 is a wasteful number, since it uses less digits than its factorization.

671685545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3160.

The product of its digits is 1008000, while the sum is 47.

The square root of 671685545 is about 25916.8969014425. The cubic root of 671685545 is about 875.7671834780.

The spelling of 671685545 in words is "six hundred seventy-one million, six hundred eighty-five thousand, five hundred forty-five".