999999961946177 has 32 divisors (see below), whose sum is σ = 1031009919357600. Its totient is φ = 969318675578880.

The previous prime is 999999961946143. The next prime is 999999961946189. The reversal of 999999961946177 is 771649169999999.

It is a happy number.

It is a Cunningham number, because it is equal to 31622776²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 718664789189776 + 281335172756401 = 26807924^2 + 16773049^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999961946177 - 2⁸ = 999999961945921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999999961946977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31398142949 + ... + 31398174797.

It is an arithmetic number, because the mean of its divisors is an integer number (32219059979925).

Almost surely, 2^{999999961946177} is an apocalyptic number.

It is an amenable number.

999999961946177 is a deficient number, since it is larger than the sum of its proper divisors (31009957411423).

999999961946177 is a wasteful number, since it uses less digits than its factorization.

999999961946177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37013.

The product of its digits is 303737663376, while the sum is 104.

The spelling of 999999961946177 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred sixty-one million, nine hundred forty-six thousand, one hundred seventy-seven".