5555621601 has 10 divisors (see below), whose sum is σ = 8299138562. Its totient is φ = 3703747680.

The previous prime is 5555621567. The next prime is 5555621657. The reversal of 5555621601 is 1061265555.

It can be written as a sum of positive squares in only one way, i.e., 5446440000 + 109181601 = 73800^2 + 10449^2 .

It is not a de Polignac number, because 5555621601 - 2⁶ = 5555621537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5555628601) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 34293880 + ... + 34294041.

Almost surely, 2^5555621601 is an apocalyptic number.

It is an amenable number.

5555621601 is a deficient number, since it is larger than the sum of its proper divisors (2743516961).

5555621601 is an equidigital number, since it uses as much as digits as its factorization.

5555621601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68587933 (or 68587924 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The square root of 5555621601 is about 74536.0422949864. The cubic root of 5555621601 is about 1771.1046336523.

The spelling of 5555621601 in words is "five billion, five hundred fifty-five million, six hundred twenty-one thousand, six hundred one".