191157043440 has 320 divisors, whose sum is σ = 668234944512. Its totient is φ = 44784230400.

The previous prime is 191157043411. The next prime is 191157043487. The reversal of 191157043440 is 44340751191.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 89450052 + ... + 89452188.

Almost surely, 2^191157043440 is an apocalyptic number.

191157043440 is a gapful number since it is divisible by the number (10) 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 191157043440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334117472256).

191157043440 is an abundant number, since it is smaller than the sum of its proper divisors (477077901072).

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

191157043440 is a wasteful number, since it uses less digits than its factorization.

191157043440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3288 (or 3282 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 191157043440 in words is "one hundred ninety-one billion, one hundred fifty-seven million, forty-three thousand, four hundred forty".