11315978569 has 4 divisors (see below), whose sum is σ = 12932546944. Its totient is φ = 9699410196.

The previous prime is 11315978567. The next prime is 11315978591. The reversal of 11315978569 is 96587951311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11315978569 - 2¹ = 11315978567 is a prime.

It is a super-2 number, since 2×11315978569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11315978567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808284177 + ... + 808284190.

It is an arithmetic number, because the mean of its divisors is an integer number (3233136736).

Almost surely, 2^11315978569 is an apocalyptic number.

It is an amenable number.

11315978569 is a deficient number, since it is larger than the sum of its proper divisors (1616568375).

11315978569 is an equidigital number, since it uses as much as digits as its factorization.

11315978569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616568374.

The product of its digits is 2041200, while the sum is 55.

The spelling of 11315978569 in words is "eleven billion, three hundred fifteen million, nine hundred seventy-eight thousand, five hundred sixty-nine".