8164205778000 has 80 divisors (see below), whose sum is σ = 26321399447616. Its totient is φ = 2177121539200.

The previous prime is 8164205777939. The next prime is 8164205778037. The reversal of 8164205778000 is 8775024618.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 680344482 + ... + 680356481.

Almost surely, 2^{8164205778000} is an apocalyptic number.

8164205778000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8164205778000 is an abundant number, since it is smaller than the sum of its proper divisors (18157193669616).

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

8164205778000 is a wasteful number, since it uses less digits than its factorization.

8164205778000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360700989 (or 1360700973 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 48.

The spelling of 8164205778000 in words is "eight trillion, one hundred sixty-four billion, two hundred five million, seven hundred seventy-eight thousand".