19627649399 has 2 divisors, whose sum is σ = 19627649400. Its totient is φ = 19627649398.

The previous prime is 19627649381. The next prime is 19627649441. The reversal of 19627649399 is 99394672691.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19627649399 is a prime.

It is a super-2 number, since 2×19627649399² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19627649339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9813824699 + 9813824700.

It is an arithmetic number, because the mean of its divisors is an integer number (9813824700).

Almost surely, 2^19627649399 is an apocalyptic number.

19627649399 is a deficient number, since it is larger than the sum of its proper divisors (1).

19627649399 is an equidigital number, since it uses as much as digits as its factorization.

19627649399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39680928, while the sum is 65.

The spelling of 19627649399 in words is "nineteen billion, six hundred twenty-seven million, six hundred forty-nine thousand, three hundred ninety-nine".