1991467257075 has 54 divisors (see below), whose sum is σ = 3650145623124. Its totient is φ = 1037343192480.

The previous prime is 1991467257041. The next prime is 1991467257139. The reversal of 1991467257075 is 5707527641991.

1991467257075 is a `hidden beast` number, since 19 + 9 + 1 + 46 + 7 + 2 + 570 + 7 + 5 = 666.

It is not a de Polignac number, because 1991467257075 - 2⁶ = 1991467257011 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 138800052 + ... + 138814398.

Almost surely, 2^{1991467257075} is an apocalyptic number.

1991467257075 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1991467257075 is a deficient number, since it is larger than the sum of its proper divisors (1658678366049).

1991467257075 is an frugal number, since it uses more digits than its factorization.

1991467257075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28753 (or 14398 counting only the distinct ones).

The product of its (nonzero) digits is 33339600, while the sum is 63.

The spelling of 1991467257075 in words is "one trillion, nine hundred ninety-one billion, four hundred sixty-seven million, two hundred fifty-seven thousand, seventy-five".