19618737097 has 4 divisors (see below), whose sum is σ = 20251599616. Its totient is φ = 18985874580.

The previous prime is 19618737059. The next prime is 19618737107. The reversal of 19618737097 is 79073781691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19618737097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19618737497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316431213 + ... + 316431274.

It is an arithmetic number, because the mean of its divisors is an integer number (5062899904).

Almost surely, 2^19618737097 is an apocalyptic number.

It is an amenable number.

19618737097 is a deficient number, since it is larger than the sum of its proper divisors (632862519).

19618737097 is an equidigital number, since it uses as much as digits as its factorization.

19618737097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632862518.

The product of its (nonzero) digits is 4000752, while the sum is 58.

The spelling of 19618737097 in words is "nineteen billion, six hundred eighteen million, seven hundred thirty-seven thousand, ninety-seven".