1975665623 has 2 divisors, whose sum is σ = 1975665624. Its totient is φ = 1975665622.

The previous prime is 1975665599. The next prime is 1975665691. The reversal of 1975665623 is 3265665791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1975665623 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1975665323) 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, 987832811 + 987832812.

It is an arithmetic number, because the mean of its divisors is an integer number (987832812).

Almost surely, 2^1975665623 is an apocalyptic number.

1975665623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1975665623 is an equidigital number, since it uses as much as digits as its factorization.

1975665623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200, while the sum is 50.

The square root of 1975665623 is about 44448.4602995424. The cubic root of 1975665623 is about 1254.7902853232.

The spelling of 1975665623 in words is "one billion, nine hundred seventy-five million, six hundred sixty-five thousand, six hundred twenty-three".