999887640999937 has 2 divisors, whose sum is σ = 999887640999938. Its totient is φ = 999887640999936.

The previous prime is 999887640999917. The next prime is 999887641000013. The reversal of 999887640999937 is 739999046788999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549941709098896 + 449945931901041 = 23450836^2 + 21211929^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999887640999937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999887640999937.

It is not a weakly prime, because it can be changed into another prime (999887640999917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499943820499968 + 499943820499969.

It is an arithmetic number, because the mean of its divisors is an integer number (499943820499969).

Almost surely, 2^{999887640999937} is an apocalyptic number.

It is an amenable number.

999887640999937 is a deficient number, since it is larger than the sum of its proper divisors (1).

999887640999937 is an equidigital number, since it uses as much as digits as its factorization.

999887640999937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1079956136448, while the sum is 106.

The spelling of 999887640999937 in words is "nine hundred ninety-nine trillion, eight hundred eighty-seven billion, six hundred forty million, nine hundred ninety-nine thousand, nine hundred thirty-seven".