64161637 has 2 divisors, whose sum is σ = 64161638. Its totient is φ = 64161636.

The previous prime is 64161607. The next prime is 64161649. The reversal of 64161637 is 73616146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39866596 + 24295041 = 6314^2 + 4929^2 .

It is a cyclic number.

It is not a de Polignac number, because 64161637 - 2¹⁹ = 63637349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64161607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32080818 + 32080819.

It is an arithmetic number, because the mean of its divisors is an integer number (32080819).

Almost surely, 2^64161637 is an apocalyptic number.

It is an amenable number.

64161637 is a deficient number, since it is larger than the sum of its proper divisors (1).

64161637 is an equidigital number, since it uses as much as digits as its factorization.

64161637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 64161637 is about 8010.0959419972. The cubic root of 64161637 is about 400.3364606562.

The spelling of 64161637 in words is "sixty-four million, one hundred sixty-one thousand, six hundred thirty-seven".