2190378868442 has 4 divisors (see below), whose sum is σ = 3285568302666. Its totient is φ = 1095189434220.

The previous prime is 2190378868421. The next prime is 2190378868459. The reversal of 2190378868442 is 2448688730912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1640958438001 + 549420430441 = 1280999^2 + 741229^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547594717109 + ... + 547594717112.

Almost surely, 2^{2190378868442} is an apocalyptic number.

2190378868442 is a deficient number, since it is larger than the sum of its proper divisors (1095189434224).

2190378868442 is a wasteful number, since it uses less digits than its factorization.

2190378868442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095189434223.

The product of its (nonzero) digits is 37158912, while the sum is 62.

The spelling of 2190378868442 in words is "two trillion, one hundred ninety billion, three hundred seventy-eight million, eight hundred sixty-eight thousand, four hundred forty-two".