19771681045 has 8 divisors (see below), whose sum is σ = 24544155960. Its totient is φ = 15271919040.

The previous prime is 19771680989. The next prime is 19771681063. The reversal of 19771681045 is 54018617791.

It can be written as a sum of positive squares in 4 ways, for example, as 539261284 + 19232419761 = 23222^2 + 138681^2 .

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

It is not a de Polignac number, because 19771681045 - 2¹³ = 19771672853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19771681045.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68178066 + ... + 68178355.

It is an arithmetic number, because the mean of its divisors is an integer number (3068019495).

Almost surely, 2^19771681045 is an apocalyptic number.

It is an amenable number.

19771681045 is a deficient number, since it is larger than the sum of its proper divisors (4772474915).

19771681045 is a wasteful number, since it uses less digits than its factorization.

19771681045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136356455.

The product of its (nonzero) digits is 423360, while the sum is 49.

The spelling of 19771681045 in words is "nineteen billion, seven hundred seventy-one million, six hundred eighty-one thousand, forty-five".