19778590933 has 32 divisors (see below), whose sum is σ = 21549939840. Its totient is φ = 18113222400.

The previous prime is 19778590879. The next prime is 19778590939. The reversal of 19778590933 is 33909587791.

It is a cyclic number.

It is not a de Polignac number, because 19778590933 - 2⁹ = 19778590421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19778590939) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6673710 + ... + 6676672.

It is an arithmetic number, because the mean of its divisors is an integer number (673435620).

Almost surely, 2^19778590933 is an apocalyptic number.

It is an amenable number.

19778590933 is a deficient number, since it is larger than the sum of its proper divisors (1771348907).

19778590933 is a wasteful number, since it uses less digits than its factorization.

19778590933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189.

The product of its (nonzero) digits is 12859560, while the sum is 61.

The spelling of 19778590933 in words is "nineteen billion, seven hundred seventy-eight million, five hundred ninety thousand, nine hundred thirty-three".