2178660947164 has 24 divisors (see below), whose sum is σ = 4106114545568. Its totient is φ = 1005492571200.

The previous prime is 2178660947159. The next prime is 2178660947201. The reversal of 2178660947164 is 4617490668712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335689 + ... + 2114239.

Almost surely, 2^{2178660947164} is an apocalyptic number.

It is an amenable number.

2178660947164 is a deficient number, since it is larger than the sum of its proper divisors (1927453598404).

2178660947164 is a wasteful number, since it uses less digits than its factorization.

2178660947164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802125 (or 1802123 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 61.

It can be divided in two parts, 2178660 and 947164, that added together give a square (3125824 = 1768²).

The spelling of 2178660947164 in words is "two trillion, one hundred seventy-eight billion, six hundred sixty million, nine hundred forty-seven thousand, one hundred sixty-four".