19437574993 has 2 divisors, whose sum is σ = 19437574994. Its totient is φ = 19437574992.

The previous prime is 19437574979. The next prime is 19437575083. The reversal of 19437574993 is 39947573491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17832130369 + 1605444624 = 133537^2 + 40068^2 .

It is a cyclic number.

It is not a de Polignac number, because 19437574993 - 2¹³ = 19437566801 is a prime.

It is not a weakly prime, because it can be changed into another prime (19437574943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9718787496 + 9718787497.

It is an arithmetic number, because the mean of its divisors is an integer number (9718787497).

Almost surely, 2^19437574993 is an apocalyptic number.

It is an amenable number.

19437574993 is a deficient number, since it is larger than the sum of its proper divisors (1).

19437574993 is an equidigital number, since it uses as much as digits as its factorization.

19437574993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25719120, while the sum is 61.

The spelling of 19437574993 in words is "nineteen billion, four hundred thirty-seven million, five hundred seventy-four thousand, nine hundred ninety-three".