11621661132517 has 2 divisors, whose sum is σ = 11621661132518. Its totient is φ = 11621661132516.

The previous prime is 11621661132509. The next prime is 11621661132577. The reversal of 11621661132517 is 71523116612611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10315408721121 + 1306252411396 = 3211761^2 + 1142914^2 .

It is a cyclic number.

It is not a de Polignac number, because 11621661132517 - 2³ = 11621661132509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11621661132577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5810830566258 + 5810830566259.

It is an arithmetic number, because the mean of its divisors is an integer number (5810830566259).

Almost surely, 2^{11621661132517} is an apocalyptic number.

It is an amenable number.

11621661132517 is a deficient number, since it is larger than the sum of its proper divisors (1).

11621661132517 is an equidigital number, since it uses as much as digits as its factorization.

11621661132517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The spelling of 11621661132517 in words is "eleven trillion, six hundred twenty-one billion, six hundred sixty-one million, one hundred thirty-two thousand, five hundred seventeen".