2178649291938 has 32 divisors (see below), whose sum is σ = 5085722363904. Its totient is φ = 609227157072.

The previous prime is 2178649291901. The next prime is 2178649291961. The reversal of 2178649291938 is 8391929468712.

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, 551834220 + ... + 551838167.

It is an arithmetic number, because the mean of its divisors is an integer number (158928823872).

Almost surely, 2^{2178649291938} is an apocalyptic number.

2178649291938 is an abundant number, since it is smaller than the sum of its proper divisors (2907073071966).

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

2178649291938 is a wasteful number, since it uses less digits than its factorization.

2178649291938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103672446.

The product of its digits is 94058496, while the sum is 69.

The spelling of 2178649291938 in words is "two trillion, one hundred seventy-eight billion, six hundred forty-nine million, two hundred ninety-one thousand, nine hundred thirty-eight".