1673981065 has 24 divisors (see below), whose sum is σ = 2089877400. Its totient is φ = 1287143424.

The previous prime is 1673981063. The next prime is 1673981077. The reversal of 1673981065 is 5601893761.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 60512841 + 1613468224 = 7779^2 + 40168^2 .

It is not a de Polignac number, because 1673981065 - 2¹ = 1673981063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1673981063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1079911 + ... + 1081459.

It is an arithmetic number, because the mean of its divisors is an integer number (87078225).

Almost surely, 2^1673981065 is an apocalyptic number.

It is an amenable number.

1673981065 is a deficient number, since it is larger than the sum of its proper divisors (415896335).

1673981065 is a wasteful number, since it uses less digits than its factorization.

1673981065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1869 (or 1840 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 1673981065 is about 40914.3136933763. The cubic root of 1673981065 is about 1187.3630060248.

The spelling of 1673981065 in words is "one billion, six hundred seventy-three million, nine hundred eighty-one thousand, sixty-five".