19540865088 has 140 divisors (see below), whose sum is σ = 58088735232. Its totient is φ = 6495240960.

The previous prime is 19540865087. The next prime is 19540865143. The reversal of 19540865088 is 88056804591.

It is a happy number.

19540865088 is a `hidden beast` number, since 1 + 9 + 54 + 0 + 86 + 508 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (19540865081) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1897393 + ... + 1907663.

Almost surely, 2^19540865088 is an apocalyptic number.

19540865088 is a gapful number since it is divisible by the number (18) 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 19540865088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29044367616).

19540865088 is an abundant number, since it is smaller than the sum of its proper divisors (38547870144).

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

19540865088 is a wasteful number, since it uses less digits than its factorization.

19540865088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10662 (or 10643 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 54.

The spelling of 19540865088 in words is "nineteen billion, five hundred forty million, eight hundred sixty-five thousand, eighty-eight".