1671612757 has 2 divisors, whose sum is σ = 1671612758. Its totient is φ = 1671612756.

The previous prime is 1671612727. The next prime is 1671612769. The reversal of 1671612757 is 7572161761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1101310596 + 570302161 = 33186^2 + 23881^2 .

It is an emirp because it is prime and its reverse (7572161761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1671612757 - 2¹⁹ = 1671088469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1671612727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835806378 + 835806379.

It is an arithmetic number, because the mean of its divisors is an integer number (835806379).

Almost surely, 2^1671612757 is an apocalyptic number.

It is an amenable number.

1671612757 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671612757 is an equidigital number, since it uses as much as digits as its factorization.

1671612757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123480, while the sum is 43.

The square root of 1671612757 is about 40885.3611577543. The cubic root of 1671612757 is about 1186.8027909096.

The spelling of 1671612757 in words is "one billion, six hundred seventy-one million, six hundred twelve thousand, seven hundred fifty-seven".