1673656045 has 4 divisors (see below), whose sum is σ = 2008387260. Its totient is φ = 1338924832.

The previous prime is 1673656043. The next prime is 1673656063. The reversal of 1673656045 is 5406563761.

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

It can be written as a sum of positive squares in 2 ways, for example, as 205463556 + 1468192489 = 14334^2 + 38317^2 .

It is a cyclic number.

It is not a de Polignac number, because 1673656045 - 2¹ = 1673656043 is a prime.

It is a super-2 number, since 2×1673656045² = 5602249113930084050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1673655992 and 1673656010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1673656043) 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 3 ways as a sum of consecutive naturals, for example, 167365600 + ... + 167365609.

It is an arithmetic number, because the mean of its divisors is an integer number (502096815).

Almost surely, 2^1673656045 is an apocalyptic number.

It is an amenable number.

1673656045 is a deficient number, since it is larger than the sum of its proper divisors (334731215).

1673656045 is an equidigital number, since it uses as much as digits as its factorization.

1673656045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334731214.

The product of its (nonzero) digits is 453600, while the sum is 43.

The square root of 1673656045 is about 40910.3415409845. The cubic root of 1673656045 is about 1187.2861549557.

The spelling of 1673656045 in words is "one billion, six hundred seventy-three million, six hundred fifty-six thousand, forty-five".