11375715649 has 3 divisors (see below), whose sum is σ = 11375822307. Its totient is φ = 11375608992.

The previous prime is 11375715647. The next prime is 11375715671. The reversal of 11375715649 is 94651757311.

It is a happy number.

The square root of 11375715649 is 106657.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 10669857025 + 705858624 = 103295^2 + 26568^2 .

It is not a de Polignac number, because 11375715649 - 2¹ = 11375715647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11375715647) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 53329 + ... + 159985.

It is an arithmetic number, because the mean of its divisors is an integer number (3791940769).

Almost surely, 2^11375715649 is an apocalyptic number.

11375715649 is the 106657-th square number.

11375715649 is the 53329-th centered octagonal number.

It is an amenable number.

11375715649 is a deficient number, since it is larger than the sum of its proper divisors (106658).

11375715649 is an frugal number, since it uses more digits than its factorization.

11375715649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213314 (or 106657 counting only the distinct ones).

The product of its digits is 793800, while the sum is 49.

Multiplying 11375715649 by its sum of digits (49), we get a square (557410066801 = 746599²).

The spelling of 11375715649 in words is "eleven billion, three hundred seventy-five million, seven hundred fifteen thousand, six hundred forty-nine".