406199515861 has 2 divisors, whose sum is σ = 406199515862. Its totient is φ = 406199515860.

The previous prime is 406199515849. The next prime is 406199515903. The reversal of 406199515861 is 168515991604.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 307587815236 + 98611700625 = 554606^2 + 314025^2 .

It is a cyclic number.

It is not a de Polignac number, because 406199515861 - 2²³ = 406191127253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406199515801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203099757930 + 203099757931.

It is an arithmetic number, because the mean of its divisors is an integer number (203099757931).

Almost surely, 2^406199515861 is an apocalyptic number.

It is an amenable number.

406199515861 is a deficient number, since it is larger than the sum of its proper divisors (1).

406199515861 is an equidigital number, since it uses as much as digits as its factorization.

406199515861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 55.

The spelling of 406199515861 in words is "four hundred six billion, one hundred ninety-nine million, five hundred fifteen thousand, eight hundred sixty-one".