55616642 has 4 divisors (see below), whose sum is σ = 83424966. Its totient is φ = 27808320.

The previous prime is 55616641. The next prime is 55616647. The reversal of 55616642 is 24661655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24661655 = 5 ⋅4932331.

It can be written as a sum of positive squares in only one way, i.e., 49716601 + 5900041 = 7051^2 + 2429^2 .

It is not an unprimeable number, because it can be changed into a prime (55616641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13904159 + ... + 13904162.

Almost surely, 2^55616642 is an apocalyptic number.

55616642 is a deficient number, since it is larger than the sum of its proper divisors (27808324).

55616642 is a wasteful number, since it uses less digits than its factorization.

55616642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27808323.

The product of its digits is 43200, while the sum is 35.

The square root of 55616642 is about 7457.6566024456. The cubic root of 55616642 is about 381.7112160029.

The spelling of 55616642 in words is "fifty-five million, six hundred sixteen thousand, six hundred forty-two".