15555001606 has 4 divisors (see below), whose sum is σ = 23332502412. Its totient is φ = 7777500802.

The previous prime is 15555001597. The next prime is 15555001663. The reversal of 15555001606 is 60610055551.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3888750400 + ... + 3888750403.

It is an arithmetic number, because the mean of its divisors is an integer number (5833125603).

Almost surely, 2^15555001606 is an apocalyptic number.

15555001606 is a deficient number, since it is larger than the sum of its proper divisors (7777500806).

15555001606 is an equidigital number, since it uses as much as digits as its factorization.

15555001606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7777500805.

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 15555001606 in words is "fifteen billion, five hundred fifty-five million, one thousand, six hundred six".