55206619 has 8 divisors (see below), whose sum is σ = 59525312. Its totient is φ = 50898240.

The previous prime is 55206617. The next prime is 55206631. The reversal of 55206619 is 91660255.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 55206619 - 2¹ = 55206617 is a prime.

It is a super-2 number, since 2×55206619² = 6095541562822322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55206617) 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, 11374 + ... + 15484.

It is an arithmetic number, because the mean of its divisors is an integer number (7440664).

Almost surely, 2^55206619 is an apocalyptic number.

55206619 is a deficient number, since it is larger than the sum of its proper divisors (4318693).

55206619 is a wasteful number, since it uses less digits than its factorization.

55206619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5157.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 55206619 is about 7430.1156787765. The cubic root of 55206619 is about 380.7708705143.

The spelling of 55206619 in words is "fifty-five million, two hundred six thousand, six hundred nineteen".