999971303761 has 128 divisors (see below), whose sum is σ = 1192976547840. Its totient is φ = 832641638400.

The previous prime is 999971303731. The next prime is 999971303777. The reversal of 999971303761 is 167303179999.

It is a happy number.

It is a 4-Lehmer number, since φ(999971303761) divides (999971303761-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 999971303761 - 2⁷ = 999971303633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999971303693 and 999971303702.

It is not an unprimeable number, because it can be changed into a prime (999971303731) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6369243895 + ... + 6369244051.

It is an arithmetic number, because the mean of its divisors is an integer number (9320129280).

It is a Poulet number, since it divides 2^999971303760-1.

Almost surely, 2^999971303761 is an apocalyptic number.

It is an amenable number.

999971303761 is a deficient number, since it is larger than the sum of its proper divisors (193005244079).

999971303761 is a wasteful number, since it uses less digits than its factorization.

999971303761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495.

The product of its (nonzero) digits is 17360406, while the sum is 64.

The spelling of 999971303761 in words is "nine hundred ninety-nine billion, nine hundred seventy-one million, three hundred three thousand, seven hundred sixty-one".