999999949013957 has 4 divisors (see below), whose sum is σ = 1024390191672876. Its totient is φ = 975609706355040.

The previous prime is 999999949013941. The next prime is 999999949013959. The reversal of 999999949013957 is 759310949999999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 428920626739201 + 571079322274756 = 20710399^2 + 23897266^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999949013957 - 2⁴ = 999999949013941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999949013959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12195121329398 + ... + 12195121329479.

It is an arithmetic number, because the mean of its divisors is an integer number (256097547918219).

Almost surely, 2^{999999949013957} is an apocalyptic number.

It is an amenable number.

999999949013957 is a deficient number, since it is larger than the sum of its proper divisors (24390242658919).

999999949013957 is a wasteful number, since it uses less digits than its factorization.

999999949013957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24390242658918.

The product of its (nonzero) digits is 162716605380, while the sum is 101.

The spelling of 999999949013957 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred forty-nine million, thirteen thousand, nine hundred fifty-seven".