11815170551 has 2 divisors, whose sum is σ = 11815170552. Its totient is φ = 11815170550.

The previous prime is 11815170533. The next prime is 11815170607. The reversal of 11815170551 is 15507151811.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11815170551 - 2⁶ = 11815170487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11815170511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5907585275 + 5907585276.

It is an arithmetic number, because the mean of its divisors is an integer number (5907585276).

Almost surely, 2^11815170551 is an apocalyptic number.

11815170551 is a deficient number, since it is larger than the sum of its proper divisors (1).

11815170551 is an equidigital number, since it uses as much as digits as its factorization.

11815170551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 35.

The spelling of 11815170551 in words is "eleven billion, eight hundred fifteen million, one hundred seventy thousand, five hundred fifty-one".