2215937378643 has 4 divisors (see below), whose sum is σ = 2954583171528. Its totient is φ = 1477291585760.

The previous prime is 2215937378569. The next prime is 2215937378687. The reversal of 2215937378643 is 3468737395122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2215937378643 - 2¹⁴ = 2215937362259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2215937378143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369322896438 + ... + 369322896443.

It is an arithmetic number, because the mean of its divisors is an integer number (738645792882).

Almost surely, 2^{2215937378643} is an apocalyptic number.

2215937378643 is a deficient number, since it is larger than the sum of its proper divisors (738645792885).

2215937378643 is an equidigital number, since it uses as much as digits as its factorization.

2215937378643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738645792884.

The product of its digits is 45722880, while the sum is 60.

The spelling of 2215937378643 in words is "two trillion, two hundred fifteen billion, nine hundred thirty-seven million, three hundred seventy-eight thousand, six hundred forty-three".