19781429555 has 8 divisors (see below), whose sum is σ = 23825310144. Its totient is φ = 15766747200.

The previous prime is 19781429509. The next prime is 19781429567. The reversal of 19781429555 is 55592418791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19781429555 - 2¹² = 19781425459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19781429555.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7298066 + ... + 7300775.

It is an arithmetic number, because the mean of its divisors is an integer number (2978163768).

Almost surely, 2^19781429555 is an apocalyptic number.

19781429555 is a deficient number, since it is larger than the sum of its proper divisors (4043880589).

19781429555 is a wasteful number, since it uses less digits than its factorization.

19781429555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14599117.

The product of its digits is 4536000, while the sum is 56.

The spelling of 19781429555 in words is "nineteen billion, seven hundred eighty-one million, four hundred twenty-nine thousand, five hundred fifty-five".