15550566601 has 4 divisors (see below), whose sum is σ = 15843973572. Its totient is φ = 15257159632.

The previous prime is 15550566583. The next prime is 15550566623. The reversal of 15550566601 is 10666505551.

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 5369958400 + 10180608201 = 73280^2 + 100899^2 .

It is a cyclic number.

It is not a de Polignac number, because 15550566601 - 2⁹ = 15550566089 is a prime.

It is a super-2 number, since 2×15550566601² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15550566401) 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, 146703406 + ... + 146703511.

It is an arithmetic number, because the mean of its divisors is an integer number (3960993393).

Almost surely, 2^15550566601 is an apocalyptic number.

It is an amenable number.

15550566601 is a deficient number, since it is larger than the sum of its proper divisors (293406971).

15550566601 is an equidigital number, since it uses as much as digits as its factorization.

15550566601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293406970.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 15550566601 in words is "fifteen billion, five hundred fifty million, five hundred sixty-six thousand, six hundred one".