1640167741 has 2 divisors, whose sum is σ = 1640167742. Its totient is φ = 1640167740.

The previous prime is 1640167693. The next prime is 1640167757. The reversal of 1640167741 is 1477610461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1476864900 + 163302841 = 38430^2 + 12779^2 .

It is an emirp because it is prime and its reverse (1477610461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640167741 - 2¹⁵ = 1640134973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1640167741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640167141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820083870 + 820083871.

It is an arithmetic number, because the mean of its divisors is an integer number (820083871).

Almost surely, 2^1640167741 is an apocalyptic number.

It is an amenable number.

1640167741 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640167741 is an equidigital number, since it uses as much as digits as its factorization.

1640167741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 1640167741 is about 40498.9844440574. The cubic root of 1640167741 is about 1179.3139124264.

The spelling of 1640167741 in words is "one billion, six hundred forty million, one hundred sixty-seven thousand, seven hundred forty-one".