191903841540 has 36 divisors (see below), whose sum is σ = 582108319884. Its totient is φ = 51174357696.

The previous prime is 191903841533. The next prime is 191903841559. The reversal of 191903841540 is 45148309191.

191903841540 is a `hidden beast` number, since 1 + 9 + 190 + 3 + 8 + 415 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 25850851524 + 166052990016 = 160782^2 + 407496^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 533066047 + ... + 533066406.

Almost surely, 2^191903841540 is an apocalyptic number.

191903841540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191903841540 is an abundant number, since it is smaller than the sum of its proper divisors (390204478344).

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

191903841540 is a wasteful number, since it uses less digits than its factorization.

191903841540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066132468 (or 1066132463 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 191903841540 in words is "one hundred ninety-one billion, nine hundred three million, eight hundred forty-one thousand, five hundred forty".