191478211875 has 160 divisors (see below), whose sum is σ = 374130240000. Its totient is φ = 96488496000.

The previous prime is 191478211861. The next prime is 191478211877. The reversal of 191478211875 is 578112874191.

It is a happy number.

191478211875 is a `hidden beast` number, since 1 + 91 + 478 + 2 + 1 + 1 + 87 + 5 = 666.

It is not a de Polignac number, because 191478211875 - 2⁵ = 191478211843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191478211877) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 192053877 + ... + 192054873.

It is an arithmetic number, because the mean of its divisors is an integer number (2338314000).

Almost surely, 2^191478211875 is an apocalyptic number.

191478211875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

191478211875 is a deficient number, since it is larger than the sum of its proper divisors (182652028125).

191478211875 is an equidigital number, since it uses as much as digits as its factorization.

191478211875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644 (or 1623 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 54.

The spelling of 191478211875 in words is "one hundred ninety-one billion, four hundred seventy-eight million, two hundred eleven thousand, eight hundred seventy-five".