19906297757 has 4 divisors (see below), whose sum is σ = 20103389916. Its totient is φ = 19709205600.

The previous prime is 19906297729. The next prime is 19906297759. The reversal of 19906297757 is 75779260991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19180588036 + 725709721 = 138494^2 + 26939^2 .

It is a cyclic number.

It is not a de Polignac number, because 19906297757 - 2⁸ = 19906297501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19906297757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19906297759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98545928 + ... + 98546129.

It is an arithmetic number, because the mean of its divisors is an integer number (5025847479).

Almost surely, 2^19906297757 is an apocalyptic number.

It is an amenable number.

19906297757 is a deficient number, since it is larger than the sum of its proper divisors (197092159).

19906297757 is a wasteful number, since it uses less digits than its factorization.

19906297757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197092158.

The product of its (nonzero) digits is 15002820, while the sum is 62.

The spelling of 19906297757 in words is "nineteen billion, nine hundred six million, two hundred ninety-seven thousand, seven hundred fifty-seven".