1640229953 has 2 divisors, whose sum is σ = 1640229954. Its totient is φ = 1640229952.

The previous prime is 1640229911. The next prime is 1640229961. The reversal of 1640229953 is 3599220461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1594963969 + 45265984 = 39937^2 + 6728^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640229953 - 2¹⁰ = 1640228929 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640229953.

It is not a weakly prime, because it can be changed into another prime (1640229553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820114976 + 820114977.

It is an arithmetic number, because the mean of its divisors is an integer number (820114977).

Almost surely, 2^1640229953 is an apocalyptic number.

It is an amenable number.

1640229953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640229953 is an equidigital number, since it uses as much as digits as its factorization.

1640229953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 1640229953 is about 40499.7525054166. The cubic root of 1640229953 is about 1179.3288228017.

The spelling of 1640229953 in words is "one billion, six hundred forty million, two hundred twenty-nine thousand, nine hundred fifty-three".