66900542 has 16 divisors (see below), whose sum is σ = 109683072. Its totient is φ = 30466560.

The previous prime is 66900541. The next prime is 66900563. The reversal of 66900542 is 24500966.

It is a junction number, because it is equal to n+sod(n) for n = 66900499 and 66900508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66900541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30683 + ... + 32790.

It is an arithmetic number, because the mean of its divisors is an integer number (6855192).

Almost surely, 2^66900542 is an apocalyptic number.

66900542 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

66900542 is a deficient number, since it is larger than the sum of its proper divisors (42782530).

66900542 is a wasteful number, since it uses less digits than its factorization.

66900542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63523.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 66900542 is about 8179.2751512588. The cubic root of 66900542 is about 405.9537386522.

The spelling of 66900542 in words is "sixty-six million, nine hundred thousand, five hundred forty-two".