1640162549 has 2 divisors, whose sum is σ = 1640162550. Its totient is φ = 1640162548.

The previous prime is 1640162527. The next prime is 1640162597. The reversal of 1640162549 is 9452610461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1538051524 + 102111025 = 39218^2 + 10105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640162549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640164549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820081274 + 820081275.

It is an arithmetic number, because the mean of its divisors is an integer number (820081275).

Almost surely, 2^1640162549 is an apocalyptic number.

It is an amenable number.

1640162549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640162549 is an equidigital number, since it uses as much as digits as its factorization.

1640162549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 1640162549 is about 40498.9203436339. The cubic root of 1640162549 is about 1179.3126680407.

The spelling of 1640162549 in words is "one billion, six hundred forty million, one hundred sixty-two thousand, five hundred forty-nine".