690636642041 has 2 divisors, whose sum is σ = 690636642042. Its totient is φ = 690636642040.

The previous prime is 690636641987. The next prime is 690636642097. The reversal of 690636642041 is 140246636096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 573648700816 + 116987941225 = 757396^2 + 342035^2 .

It is a cyclic number.

It is not a de Polignac number, because 690636642041 - 2⁶ = 690636641977 is a prime.

It is not a weakly prime, because it can be changed into another prime (690636641041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345318321020 + 345318321021.

It is an arithmetic number, because the mean of its divisors is an integer number (345318321021).

Almost surely, 2^690636642041 is an apocalyptic number.

It is an amenable number.

690636642041 is a deficient number, since it is larger than the sum of its proper divisors (1).

690636642041 is an equidigital number, since it uses as much as digits as its factorization.

690636642041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 47.

The spelling of 690636642041 in words is "six hundred ninety billion, six hundred thirty-six million, six hundred forty-two thousand, forty-one".