1678655553 has 8 divisors (see below), whose sum is σ = 2298699648. Its totient is φ = 1088857584.

The previous prime is 1678655507. The next prime is 1678655557. The reversal of 1678655553 is 3555568761.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1678655553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1678655496 and 1678655505.

It is not an unprimeable number, because it can be changed into a prime (1678655557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7561401 + ... + 7561622.

It is an arithmetic number, because the mean of its divisors is an integer number (287337456).

Almost surely, 2^1678655553 is an apocalyptic number.

It is an amenable number.

1678655553 is a deficient number, since it is larger than the sum of its proper divisors (620044095).

1678655553 is a wasteful number, since it uses less digits than its factorization.

1678655553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15123063.

The product of its digits is 3780000, while the sum is 51.

The square root of 1678655553 is about 40971.3992072519. The cubic root of 1678655553 is about 1188.4671913183.

It can be divided in two parts, 1678 and 655553, that added together give a triangular number (657231 = T₁₁₄₆).

The spelling of 1678655553 in words is "one billion, six hundred seventy-eight million, six hundred fifty-five thousand, five hundred fifty-three".