537666021 has 24 divisors (see below), whose sum is σ = 832740480. Its totient is φ = 333081216.

The previous prime is 537666007. The next prime is 537666037. The reversal of 537666021 is 120666735.

It is not a de Polignac number, because 537666021 - 2⁹ = 537665509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (537666001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10155 + ... + 34328.

It is an arithmetic number, because the mean of its divisors is an integer number (34697520).

Almost surely, 2^537666021 is an apocalyptic number.

537666021 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

537666021 is a deficient number, since it is larger than the sum of its proper divisors (295074459).

537666021 is a wasteful number, since it uses less digits than its factorization.

537666021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44585 (or 44582 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 537666021 is about 23187.6264632670. The cubic root of 537666021 is about 813.1503695576.

The spelling of 537666021 in words is "five hundred thirty-seven million, six hundred sixty-six thousand, twenty-one".