1555265649 has 16 divisors (see below), whose sum is σ = 2376294272. Its totient is φ = 886336128.

The previous prime is 1555265623. The next prime is 1555265671. The reversal of 1555265649 is 9465625551.

It is not a de Polignac number, because 1555265649 - 2⁵ = 1555265617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1555265598 and 1555265607.

It is not an unprimeable number, because it can be changed into a prime (1555265609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91444 + ... + 107109.

It is an arithmetic number, because the mean of its divisors is an integer number (148518392).

Almost surely, 2^1555265649 is an apocalyptic number.

It is an amenable number.

1555265649 is a deficient number, since it is larger than the sum of its proper divisors (821028623).

1555265649 is a wasteful number, since it uses less digits than its factorization.

1555265649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198936.

The product of its digits is 1620000, while the sum is 48.

The square root of 1555265649 is about 39436.8564796942. The cubic root of 1555265649 is about 1158.6035636154.

The spelling of 1555265649 in words is "one billion, five hundred fifty-five million, two hundred sixty-five thousand, six hundred forty-nine".