19541687490 has 48 divisors (see below), whose sum is σ = 54716728248. Its totient is φ = 4810261248.

The previous prime is 19541687449. The next prime is 19541687491. The reversal of 19541687490 is 9478614591.

19541687490 is a `hidden beast` number, since 1 + 9 + 541 + 6 + 8 + 7 + 4 + 90 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12651525441 + 6890162049 = 112479^2 + 83007^2 .

It is not an unprimeable number, because it can be changed into a prime (19541687491) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8349979 + ... + 8352318.

Almost surely, 2^19541687490 is an apocalyptic number.

19541687490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19541687490 is an abundant number, since it is smaller than the sum of its proper divisors (35175040758).

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

19541687490 is a wasteful number, since it uses less digits than its factorization.

19541687490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16702323 (or 16702320 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 19541687490 in words is "nineteen billion, five hundred forty-one million, six hundred eighty-seven thousand, four hundred ninety".