551644642 has 4 divisors (see below), whose sum is σ = 827466966. Its totient is φ = 275822320.

The previous prime is 551644607. The next prime is 551644663. The reversal of 551644642 is 246446155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246446155 = 5 ⋅49289231.

It can be written as a sum of positive squares in only one way, i.e., 546577641 + 5067001 = 23379^2 + 2251^2 .

It is a super-2 number, since 2×551644642² = 608623622094616328, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137911159 + ... + 137911162.

Almost surely, 2^551644642 is an apocalyptic number.

551644642 is a deficient number, since it is larger than the sum of its proper divisors (275822324).

551644642 is a wasteful number, since it uses less digits than its factorization.

551644642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275822323.

The product of its digits is 115200, while the sum is 37.

The square root of 551644642 is about 23487.1165109726. The cubic root of 551644642 is about 820.1371186524.

The spelling of 551644642 in words is "five hundred fifty-one million, six hundred forty-four thousand, six hundred forty-two".