1009999747957 has 2 divisors, whose sum is σ = 1009999747958. Its totient is φ = 1009999747956.

The previous prime is 1009999747931. The next prime is 1009999747969. The reversal of 1009999747957 is 7597479999001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 818217938916 + 191781809041 = 904554^2 + 437929^2 .

It is a cyclic number.

It is not a de Polignac number, because 1009999747957 - 2¹⁹ = 1009999223669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1009999747997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504999873978 + 504999873979.

It is an arithmetic number, because the mean of its divisors is an integer number (504999873979).

Almost surely, 2^{1009999747957} is an apocalyptic number.

It is an amenable number.

1009999747957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009999747957 is an equidigital number, since it uses as much as digits as its factorization.

1009999747957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 405076140, while the sum is 76.

The spelling of 1009999747957 in words is "one trillion, nine billion, nine hundred ninety-nine million, seven hundred forty-seven thousand, nine hundred fifty-seven".