66653542 has 16 divisors (see below), whose sum is σ = 105384240. Its totient is φ = 31568992.

The previous prime is 66653533. The next prime is 66653557. The reversal of 66653542 is 24535666.

It is a super-2 number, since 2×66653542² = 8885389322291528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7768 + ... + 13915.

It is an arithmetic number, because the mean of its divisors is an integer number (6586515).

Almost surely, 2^66653542 is an apocalyptic number.

66653542 is a deficient number, since it is larger than the sum of its proper divisors (38730698).

66653542 is a wasteful number, since it uses less digits than its factorization.

66653542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21767.

The product of its digits is 129600, while the sum is 37.

The square root of 66653542 is about 8164.1620513069. The cubic root of 66653542 is about 405.4535223339.

The spelling of 66653542 in words is "sixty-six million, six hundred fifty-three thousand, five hundred forty-two".