551543645 has 16 divisors (see below), whose sum is σ = 681869568. Its totient is φ = 427965120.

The previous prime is 551543593. The next prime is 551543659. The reversal of 551543645 is 546345155.

It is not a de Polignac number, because 551543645 - 2⁶ = 551543581 is a prime.

It is a super-3 number, since 3×551543645³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 551543599 and 551543608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56732 + ... + 65738.

It is an arithmetic number, because the mean of its divisors is an integer number (42616848).

Almost surely, 2^551543645 is an apocalyptic number.

It is an amenable number.

551543645 is a deficient number, since it is larger than the sum of its proper divisors (130325923).

551543645 is a wasteful number, since it uses less digits than its factorization.

551543645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9380.

The product of its digits is 180000, while the sum is 38.

The square root of 551543645 is about 23484.9663614833. The cubic root of 551543645 is about 820.0870644220.

The spelling of 551543645 in words is "five hundred fifty-one million, five hundred forty-three thousand, six hundred forty-five".