197763817819 has 8 divisors (see below), whose sum is σ = 198940039760. Its totient is φ = 196591051296.

The previous prime is 197763817807. The next prime is 197763817843. The reversal of 197763817819 is 918718367791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197763817819 is a prime.

It is a super-2 number, since 2×197763817819² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197763817879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749004 + ... + 978025.

It is an arithmetic number, because the mean of its divisors is an integer number (24867504970).

Almost surely, 2^197763817819 is an apocalyptic number.

197763817819 is a deficient number, since it is larger than the sum of its proper divisors (1176221941).

197763817819 is a wasteful number, since it uses less digits than its factorization.

197763817819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1727709.

The product of its digits is 32006016, while the sum is 67.

The spelling of 197763817819 in words is "one hundred ninety-seven billion, seven hundred sixty-three million, eight hundred seventeen thousand, eight hundred nineteen".