19978361934 has 16 divisors (see below), whose sum is σ = 40224891600. Its totient is φ = 6614759360.

The previous prime is 19978361929. The next prime is 19978361981. The reversal of 19978361934 is 43916387991.

It is a congruent number.

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, 11172687 + ... + 11174474.

It is an arithmetic number, because the mean of its divisors is an integer number (2514055725).

Almost surely, 2^19978361934 is an apocalyptic number.

19978361934 is an abundant number, since it is smaller than the sum of its proper divisors (20246529666).

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

19978361934 is a wasteful number, since it uses less digits than its factorization.

19978361934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22347315.

The product of its digits is 8817984, while the sum is 60.

The spelling of 19978361934 in words is "nineteen billion, nine hundred seventy-eight million, three hundred sixty-one thousand, nine hundred thirty-four".