1671612705 has 36 divisors (see below), whose sum is σ = 3370521492. Its totient is φ = 764164800.

The previous prime is 1671612697. The next prime is 1671612713. The reversal of 1671612705 is 5072161761.

It is an interprime number because it is at equal distance from previous prime (1671612697) and next prime (1671612713).

It can be written as a sum of positive squares in 2 ways, for example, as 191517921 + 1480094784 = 13839^2 + 38472^2 .

It is not a de Polignac number, because 1671612705 - 2³ = 1671612697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1671612705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 376846 + ... + 381255.

It is an arithmetic number, because the mean of its divisors is an integer number (93625597).

Almost surely, 2^1671612705 is an apocalyptic number.

1671612705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1671612705 is an abundant number, since it is smaller than the sum of its proper divisors (1698908787).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1671612705 is a wasteful number, since it uses less digits than its factorization.

1671612705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758126 (or 758116 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 1671612705 is about 40885.3605218298. The cubic root of 1671612705 is about 1186.8027786034.

The spelling of 1671612705 in words is "one billion, six hundred seventy-one million, six hundred twelve thousand, seven hundred five".