555001661 has 16 divisors (see below), whose sum is σ = 588639744. Its totient is φ = 522214704.

The previous prime is 555001631. The next prime is 555001679. The reversal of 555001661 is 166100555.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-555001661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555001631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 585590 + ... + 586536.

It is an arithmetic number, because the mean of its divisors is an integer number (36789984).

Almost surely, 2^555001661 is an apocalyptic number.

It is an amenable number.

555001661 is a deficient number, since it is larger than the sum of its proper divisors (33638083).

555001661 is a wasteful number, since it uses less digits than its factorization.

555001661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 555001661 is about 23558.4732315148. The cubic root of 555001661 is about 821.7973963092.

The spelling of 555001661 in words is "five hundred fifty-five million, one thousand, six hundred sixty-one".