55621601 has 8 divisors (see below), whose sum is σ = 64645440. Its totient is φ = 46867248.

The previous prime is 55621561. The next prime is 55621627. The reversal of 55621601 is 10612655.

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 55621601 - 2¹⁰ = 55620577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55621201) 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, 66926 + ... + 67751.

It is an arithmetic number, because the mean of its divisors is an integer number (8080680).

Almost surely, 2^55621601 is an apocalyptic number.

It is an amenable number.

55621601 is a deficient number, since it is larger than the sum of its proper divisors (9023839).

55621601 is a wasteful number, since it uses less digits than its factorization.

55621601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134743.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 55621601 is about 7457.9890721293. The cubic root of 55621601 is about 381.7225606269.

The spelling of 55621601 in words is "fifty-five million, six hundred twenty-one thousand, six hundred one".