19691253450 has 72 divisors (see below), whose sum is σ = 57713288256. Its totient is φ = 4773636000.

The previous prime is 19691253427. The next prime is 19691253469. The reversal of 19691253450 is 5435219691.

19691253450 is a `hidden beast` number, since 1 + 9 + 69 + 1 + 2 + 534 + 50 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 19691253396 and 19691253405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1984066 + ... + 1993965.

It is an arithmetic number, because the mean of its divisors is an integer number (801573448).

Almost surely, 2^19691253450 is an apocalyptic number.

19691253450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19691253450 is an abundant number, since it is smaller than the sum of its proper divisors (38022034806).

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

19691253450 is a wasteful number, since it uses less digits than its factorization.

19691253450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3978060 (or 3978052 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 19691253450 in words is "nineteen billion, six hundred ninety-one million, two hundred fifty-three thousand, four hundred fifty".