11947738445 has 6 divisors (see below), whose sum is σ = 14337579438. Its totient is φ = 9557995224.

The previous prime is 11947738433. The next prime is 11947738457. The reversal of 11947738445 is 54483774911.

It is an interprime number because it is at equal distance from previous prime (11947738433) and next prime (11947738457).

It can be written as a sum of positive squares in only one way, i.e., 9558190756 + 2389547689 = 97766^2 + 48883^2 .

It is not a de Polignac number, because 11947738445 - 2⁶ = 11947738381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219974 + ... + 268856.

It is an arithmetic number, because the mean of its divisors is an integer number (2389596573).

Almost surely, 2^11947738445 is an apocalyptic number.

It is an amenable number.

11947738445 is a deficient number, since it is larger than the sum of its proper divisors (2389840993).

11947738445 is an frugal number, since it uses more digits than its factorization.

11947738445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97771 (or 48888 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 53.

The spelling of 11947738445 in words is "eleven billion, nine hundred forty-seven million, seven hundred thirty-eight thousand, four hundred forty-five".