1779120821836 has 6 divisors (see below), whose sum is σ = 3113461438220. Its totient is φ = 889560410916.

The previous prime is 1779120821809. The next prime is 1779120821887. The reversal of 1779120821836 is 6381280219771.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222390102726 + ... + 222390102733.

Almost surely, 2^{1779120821836} is an apocalyptic number.

It is an amenable number.

1779120821836 is a deficient number, since it is larger than the sum of its proper divisors (1334340616384).

1779120821836 is a wasteful number, since it uses less digits than its factorization.

1779120821836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444780205463 (or 444780205461 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 1779120821836 in words is "one trillion, seven hundred seventy-nine billion, one hundred twenty million, eight hundred twenty-one thousand, eight hundred thirty-six".