820123749778 has 8 divisors (see below), whose sum is σ = 1231126857072. Its totient is φ = 409748130756.

The previous prime is 820123749773. The next prime is 820123749779. The reversal of 820123749778 is 877947321028.

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

It is not an unprimeable number, because it can be changed into a prime (820123749773) 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, 156868800 + ... + 156874027.

It is an arithmetic number, because the mean of its divisors is an integer number (153890857134).

Almost surely, 2^820123749778 is an apocalyptic number.

820123749778 is a deficient number, since it is larger than the sum of its proper divisors (411003107294).

820123749778 is a wasteful number, since it uses less digits than its factorization.

820123749778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313744136.

The product of its (nonzero) digits is 9483264, while the sum is 58.

The spelling of 820123749778 in words is "eight hundred twenty billion, one hundred twenty-three million, seven hundred forty-nine thousand, seven hundred seventy-eight".