191939543040 has 272 divisors, whose sum is σ = 701970139008. Its totient is φ = 43870322688.

The previous prime is 191939543039. The next prime is 191939543063. The reversal of 191939543040 is 40345939191.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6867334 + ... + 6895226.

Almost surely, 2^191939543040 is an apocalyptic number.

191939543040 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 191939543040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350985069504).

191939543040 is an abundant number, since it is smaller than the sum of its proper divisors (510030595968).

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

191939543040 is an frugal number, since it uses more digits than its factorization.

191939543040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27940 (or 27910 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 48.

The spelling of 191939543040 in words is "one hundred ninety-one billion, nine hundred thirty-nine million, five hundred forty-three thousand, forty".