17972757547 has 2 divisors, whose sum is σ = 17972757548. Its totient is φ = 17972757546.

The previous prime is 17972757469. The next prime is 17972757553. The reversal of 17972757547 is 74575727971.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17972757547 is a prime.

It is not a weakly prime, because it can be changed into another prime (17972757577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8986378773 + 8986378774.

It is an arithmetic number, because the mean of its divisors is an integer number (8986378774).

Almost surely, 2^17972757547 is an apocalyptic number.

17972757547 is a deficient number, since it is larger than the sum of its proper divisors (1).

17972757547 is an equidigital number, since it uses as much as digits as its factorization.

17972757547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30252600, while the sum is 61.

The spelling of 17972757547 in words is "seventeen billion, nine hundred seventy-two million, seven hundred fifty-seven thousand, five hundred forty-seven".