1391944722225 has 12 divisors (see below), whose sum is σ = 2301348607536. Its totient is φ = 742370518480.

The previous prime is 1391944722221. The next prime is 1391944722247. The reversal of 1391944722225 is 5222274491931.

It is not a de Polignac number, because 1391944722225 - 2² = 1391944722221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1391944722221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9279631407 + ... + 9279631556.

It is an arithmetic number, because the mean of its divisors is an integer number (191779050628).

Almost surely, 2^{1391944722225} is an apocalyptic number.

1391944722225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1391944722225 is a deficient number, since it is larger than the sum of its proper divisors (909403885311).

1391944722225 is a wasteful number, since it uses less digits than its factorization.

1391944722225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18559262976 (or 18559262971 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 51.

The spelling of 1391944722225 in words is "one trillion, three hundred ninety-one billion, nine hundred forty-four million, seven hundred twenty-two thousand, two hundred twenty-five".