19453507697 has 12 divisors (see below), whose sum is σ = 21087693900. Its totient is φ = 17937773568.

The previous prime is 19453507669. The next prime is 19453507739. The reversal of 19453507697 is 79670535491.

It can be written as a sum of positive squares in 6 ways, for example, as 7979670241 + 11473837456 = 89329^2 + 107116^2 .

It is not a de Polignac number, because 19453507697 - 2¹⁴ = 19453491313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19453507607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96929 + ... + 219777.

It is an arithmetic number, because the mean of its divisors is an integer number (1757307825).

Almost surely, 2^19453507697 is an apocalyptic number.

It is an amenable number.

19453507697 is a deficient number, since it is larger than the sum of its proper divisors (1634186203).

19453507697 is a wasteful number, since it uses less digits than its factorization.

19453507697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123812 (or 123799 counting only the distinct ones).

The product of its (nonzero) digits is 7144200, while the sum is 56.

The spelling of 19453507697 in words is "nineteen billion, four hundred fifty-three million, five hundred seven thousand, six hundred ninety-seven".