19543064940 has 144 divisors (see below), whose sum is σ = 70727378400. Its totient is φ = 4466980224.

The previous prime is 19543064929. The next prime is 19543064941. The reversal of 19543064940 is 4946034591.

19543064940 is a `hidden beast` number, since 1 + 9 + 543 + 0 + 64 + 9 + 40 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (19543064941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 342835 + ... + 395754.

It is an arithmetic number, because the mean of its divisors is an integer number (491162350).

Almost surely, 2^19543064940 is an apocalyptic number.

19543064940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19543064940 is an abundant number, since it is smaller than the sum of its proper divisors (51184313460).

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

19543064940 is a wasteful number, since it uses less digits than its factorization.

19543064940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738621 (or 738606 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 19543064940 in words is "nineteen billion, five hundred forty-three million, sixty-four thousand, nine hundred forty".