19701772453 has 4 divisors (see below), whose sum is σ = 21492842688. Its totient is φ = 17910702220.

The previous prime is 19701772421. The next prime is 19701772459. The reversal of 19701772453 is 35427710791.

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 not a de Polignac number, because 19701772453 - 2⁵ = 19701772421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19701772459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 895535101 + ... + 895535122.

It is an arithmetic number, because the mean of its divisors is an integer number (5373210672).

Almost surely, 2^19701772453 is an apocalyptic number.

It is an amenable number.

19701772453 is a deficient number, since it is larger than the sum of its proper divisors (1791070235).

19701772453 is a wasteful number, since it uses less digits than its factorization.

19701772453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791070234.

The product of its (nonzero) digits is 370440, while the sum is 46.

The spelling of 19701772453 in words is "nineteen billion, seven hundred one million, seven hundred seventy-two thousand, four hundred fifty-three".