55521659 has 2 divisors, whose sum is σ = 55521660. Its totient is φ = 55521658.

The previous prime is 55521649. The next prime is 55521673. The reversal of 55521659 is 95612555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55521659 - 2¹⁶ = 55456123 is a prime.

It is a super-2 number, since 2×55521659² = 6165309236224562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55521649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27760829 + 27760830.

It is an arithmetic number, because the mean of its divisors is an integer number (27760830).

Almost surely, 2^55521659 is an apocalyptic number.

55521659 is a deficient number, since it is larger than the sum of its proper divisors (1).

55521659 is an equidigital number, since it uses as much as digits as its factorization.

55521659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67500, while the sum is 38.

The square root of 55521659 is about 7451.2857279801. The cubic root of 55521659 is about 381.4937946563.

The spelling of 55521659 in words is "fifty-five million, five hundred twenty-one thousand, six hundred fifty-nine".