11815817077 has 8 divisors (see below), whose sum is σ = 11855510712. Its totient is φ = 11776190400.

The previous prime is 11815817023. The next prime is 11815817201. The reversal of 11815817077 is 77071851811.

It can be written as a sum of positive squares in 4 ways, for example, as 2297668356 + 9518148721 = 47934^2 + 97561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11815817077 - 2²³ = 11807428469 is a prime.

It is a super-2 number, since 2×11815817077² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11815817477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350127 + ... + 382387.

It is an arithmetic number, because the mean of its divisors is an integer number (1481938839).

Almost surely, 2^11815817077 is an apocalyptic number.

It is an amenable number.

11815817077 is a deficient number, since it is larger than the sum of its proper divisors (39693635).

11815817077 is an equidigital number, since it uses as much as digits as its factorization.

11815817077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33479.

The product of its (nonzero) digits is 109760, while the sum is 46.

The spelling of 11815817077 in words is "eleven billion, eight hundred fifteen million, eight hundred seventeen thousand, seventy-seven".