999646305451 has 2 divisors, whose sum is σ = 999646305452. Its totient is φ = 999646305450.

The previous prime is 999646305431. The next prime is 999646305461. The reversal of 999646305451 is 154503646999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999646305451 - 2¹³ = 999646297259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999646305451.

It is not a weakly prime, because it can be changed into another prime (999646305431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499823152725 + 499823152726.

It is an arithmetic number, because the mean of its divisors is an integer number (499823152726).

Almost surely, 2^999646305451 is an apocalyptic number.

999646305451 is the 447135-th centered decagonal number.

999646305451 is a deficient number, since it is larger than the sum of its proper divisors (1).

999646305451 is an equidigital number, since it uses as much as digits as its factorization.

999646305451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31492800, while the sum is 61.

The spelling of 999646305451 in words is "nine hundred ninety-nine billion, six hundred forty-six million, three hundred five thousand, four hundred fifty-one".