819758572949 has 4 divisors (see below), whose sum is σ = 819790995936. Its totient is φ = 819726149964.

The previous prime is 819758572943. The next prime is 819758572981. The reversal of 819758572949 is 949275857918.

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-819758572949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819758572943) 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, 16173539 + ... + 16224144.

It is an arithmetic number, because the mean of its divisors is an integer number (204947748984).

Almost surely, 2^819758572949 is an apocalyptic number.

It is an amenable number.

819758572949 is a deficient number, since it is larger than the sum of its proper divisors (32422987).

819758572949 is a wasteful number, since it uses less digits than its factorization.

819758572949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32422986.

The product of its digits is 457228800, while the sum is 74.

The spelling of 819758572949 in words is "eight hundred nineteen billion, seven hundred fifty-eight million, five hundred seventy-two thousand, nine hundred forty-nine".