1779658920172 has 12 divisors (see below), whose sum is σ = 3559317840400. Its totient is φ = 762710965776.

The previous prime is 1779658920167. The next prime is 1779658920181. The reversal of 1779658920172 is 2710298569771.

1779658920172 is an admirable number.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31779623547 + ... + 31779623602.

Almost surely, 2^{1779658920172} is an apocalyptic number.

It is an amenable number.

1779658920172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1779658920172 is a wasteful number, since it uses less digits than its factorization.

1779658920172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63559247160 (or 63559247158 counting only the distinct ones).

The product of its (nonzero) digits is 26671680, while the sum is 64.

The spelling of 1779658920172 in words is "one trillion, seven hundred seventy-nine billion, six hundred fifty-eight million, nine hundred twenty thousand, one hundred seventy-two".