11361431624561 has 4 divisors (see below), whose sum is σ = 11361521757300. Its totient is φ = 11361341491824.

The previous prime is 11361431624549. The next prime is 11361431624567. The reversal of 11361431624561 is 16542613416311.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3177003232225 + 8184428392336 = 1782415^2 + 2860844^2 .

It is a cyclic number.

It is not a de Polignac number, because 11361431624561 - 2¹⁰ = 11361431623537 is a prime.

It is a super-3 number, since 3×11361431624561³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11361431624567) 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, 44877026 + ... + 45129483.

It is an arithmetic number, because the mean of its divisors is an integer number (2840380439325).

Almost surely, 2^{11361431624561} is an apocalyptic number.

It is an amenable number.

11361431624561 is a deficient number, since it is larger than the sum of its proper divisors (90132739).

11361431624561 is an equidigital number, since it uses as much as digits as its factorization.

11361431624561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90132738.

The product of its digits is 311040, while the sum is 44.

The spelling of 11361431624561 in words is "eleven trillion, three hundred sixty-one billion, four hundred thirty-one million, six hundred twenty-four thousand, five hundred sixty-one".