191451254148 has 324 divisors, whose sum is σ = 634647542256. Its totient is φ = 48118795200.

The previous prime is 191451254147. The next prime is 191451254161. The reversal of 191451254148 is 841452154191.

191451254148 is a `hidden beast` number, since 1 + 9 + 1 + 451 + 2 + 54 + 148 = 666.

It is not an unprimeable number, because it can be changed into a prime (191451254147) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 18642111 + ... + 18652377.

Almost surely, 2^191451254148 is an apocalyptic number.

191451254148 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191451254148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317323771128).

191451254148 is an abundant number, since it is smaller than the sum of its proper divisors (443196288108).

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

191451254148 is a wasteful number, since it uses less digits than its factorization.

191451254148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10364 (or 10321 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The spelling of 191451254148 in words is "one hundred ninety-one billion, four hundred fifty-one million, two hundred fifty-four thousand, one hundred forty-eight".