19499394915 has 432 divisors, whose sum is σ = 47801684736. Its totient is φ = 7264857600.

The previous prime is 19499394911. The next prime is 19499394991. The reversal of 19499394915 is 51949399491.

19499394915 is a `hidden beast` number, since 19 + 49 + 93 + 9 + 491 + 5 = 666.

It is not a de Polignac number, because 19499394915 - 2² = 19499394911 is a prime.

It is a super-2 number, since 2×19499394915² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19499394911) by changing a digit.

It is a polite number, since it can be written in 431 ways as a sum of consecutive naturals, for example, 274639330 + ... + 274639400.

It is an arithmetic number, because the mean of its divisors is an integer number (110652048).

Almost surely, 2^19499394915 is an apocalyptic number.

19499394915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19499394915 is an abundant number, since it is smaller than the sum of its proper divisors (28302289821).

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

19499394915 is a wasteful number, since it uses less digits than its factorization.

19499394915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 177 counting only the distinct ones).

The product of its digits is 14171760, while the sum is 63.

It can be divided in two parts, 19499 and 394915, that added together give a palindrome (414414).

The spelling of 19499394915 in words is "nineteen billion, four hundred ninety-nine million, three hundred ninety-four thousand, nine hundred fifteen".