991667507260 has 48 divisors (see below), whose sum is σ = 2217320451360. Its totient is φ = 371247964160.

The previous prime is 991667507249. The next prime is 991667507287. The reversal of 991667507260 is 62705766199.

It is a junction number, because it is equal to n+sod(n) for n = 991667507195 and 991667507204.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8086261 + ... + 8207980.

It is an arithmetic number, because the mean of its divisors is an integer number (46194176070).

Almost surely, 2^991667507260 is an apocalyptic number.

It is an amenable number.

991667507260 is an abundant number, since it is smaller than the sum of its proper divisors (1225652944100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991667507260 is a wasteful number, since it uses less digits than its factorization.

991667507260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16294446 (or 16294444 counting only the distinct ones).

The product of its (nonzero) digits is 8573040, while the sum is 58.

The spelling of 991667507260 in words is "nine hundred ninety-one billion, six hundred sixty-seven million, five hundred seven thousand, two hundred sixty".