1673162721 has 24 divisors (see below), whose sum is σ = 2524843776. Its totient is φ = 1066439520.

The previous prime is 1673162677. The next prime is 1673162731. The reversal of 1673162721 is 1272613761.

It is a happy number.

1673162721 is a `hidden beast` number, since 1 + 6 + 7 + 3 + 1 + 627 + 21 = 666.

It is not a de Polignac number, because 1673162721 - 2¹¹ = 1673160673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1673162731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12970 + ... + 59283.

It is an arithmetic number, because the mean of its divisors is an integer number (105201824).

Almost surely, 2^1673162721 is an apocalyptic number.

It is an amenable number.

1673162721 is a deficient number, since it is larger than the sum of its proper divisors (851681055).

1673162721 is a wasteful number, since it uses less digits than its factorization.

1673162721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72373 (or 72370 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 1673162721 is about 40904.3117653873. The cubic root of 1673162721 is about 1187.1694893452.

The spelling of 1673162721 in words is "one billion, six hundred seventy-three million, one hundred sixty-two thousand, seven hundred twenty-one".