15506011500601 has 2 divisors, whose sum is σ = 15506011500602. Its totient is φ = 15506011500600.

The previous prime is 15506011500599. The next prime is 15506011500611. The reversal of 15506011500601 is 10600511060551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10996844190201 + 4509167310400 = 3316149^2 + 2123480^2 .

It is a cyclic number.

It is not a de Polignac number, because 15506011500601 - 2¹ = 15506011500599 is a prime.

It is a super-2 number, since 2×15506011500601² (a number of 27 digits) contains 22 as substring.

Together with 15506011500599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15506011500611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7753005750300 + 7753005750301.

It is an arithmetic number, because the mean of its divisors is an integer number (7753005750301).

Almost surely, 2^{15506011500601} is an apocalyptic number.

It is an amenable number.

15506011500601 is a deficient number, since it is larger than the sum of its proper divisors (1).

15506011500601 is an equidigital number, since it uses as much as digits as its factorization.

15506011500601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 15506011500601 in words is "fifteen trillion, five hundred six billion, eleven million, five hundred thousand, six hundred one".