1554165645 has 16 divisors (see below), whose sum is σ = 2496578112. Its totient is φ = 825584000.

The previous prime is 1554165643. The next prime is 1554165659. The reversal of 1554165645 is 5465614551.

It is not a de Polignac number, because 1554165645 - 2¹ = 1554165643 is a prime.

It is a super-3 number, since 3×1554165645³ (a number of 29 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1554165597 and 1554165606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1554165643) 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, 202632 + ... + 210161.

It is an arithmetic number, because the mean of its divisors is an integer number (156036132).

Almost surely, 2^1554165645 is an apocalyptic number.

1554165645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1554165645 is a deficient number, since it is larger than the sum of its proper divisors (942412467).

1554165645 is a wasteful number, since it uses less digits than its factorization.

1554165645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413052.

The product of its digits is 360000, while the sum is 42.

The square root of 1554165645 is about 39422.9076172725. The cubic root of 1554165645 is about 1158.3303478809.

The spelling of 1554165645 in words is "one billion, five hundred fifty-four million, one hundred sixty-five thousand, six hundred forty-five".