1681624553 has 16 divisors (see below), whose sum is σ = 2054336256. Its totient is φ = 1345090560.

The previous prime is 1681624541. The next prime is 1681624559. The reversal of 1681624553 is 3554261861.

It is a cyclic number.

It is not a de Polignac number, because 1681624553 - 2⁶ = 1681624489 is a prime.

It is a super-2 number, since 2×1681624553² = 5655722274504899618, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a self number, because there is not a number n which added to its sum of digits gives 1681624553.

It is not an unprimeable number, because it can be changed into a prime (1681624559) 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, 120776 + ... + 133977.

It is an arithmetic number, because the mean of its divisors is an integer number (128396016).

Almost surely, 2^1681624553 is an apocalyptic number.

It is an amenable number.

1681624553 is a deficient number, since it is larger than the sum of its proper divisors (372711703).

1681624553 is a wasteful number, since it uses less digits than its factorization.

1681624553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254824.

The product of its digits is 172800, while the sum is 41.

The square root of 1681624553 is about 41007.6157926793. The cubic root of 1681624553 is about 1189.1674502909.

The spelling of 1681624553 in words is "one billion, six hundred eighty-one million, six hundred twenty-four thousand, five hundred fifty-three".