11621588653 has 4 divisors (see below), whose sum is σ = 11621841340. Its totient is φ = 11621335968.

The previous prime is 11621588647. The next prime is 11621588663. The reversal of 11621588653 is 35688512611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35688512611 = 19 ⋅1878342769.

It can be written as a sum of positive squares in 2 ways, for example, as 6855343209 + 4766245444 = 82797^2 + 69038^2 .

It is a cyclic number.

It is not a de Polignac number, because 11621588653 - 2⁹ = 11621588141 is a prime.

It is a super-2 number, since 2×11621588653² (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 (11621588663) 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, 35658 + ... + 156571.

It is an arithmetic number, because the mean of its divisors is an integer number (2905460335).

Almost surely, 2^11621588653 is an apocalyptic number.

It is an amenable number.

11621588653 is a deficient number, since it is larger than the sum of its proper divisors (252687).

11621588653 is an equidigital number, since it uses as much as digits as its factorization.

11621588653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252686.

The product of its digits is 345600, while the sum is 46.

The spelling of 11621588653 in words is "eleven billion, six hundred twenty-one million, five hundred eighty-eight thousand, six hundred fifty-three".