66542054 has 4 divisors (see below), whose sum is σ = 99813084. Its totient is φ = 33271026.

The previous prime is 66542053. The next prime is 66542093. The reversal of 66542054 is 45024566.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66542054.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66542051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16635512 + ... + 16635515.

It is an arithmetic number, because the mean of its divisors is an integer number (24953271).

Almost surely, 2^66542054 is an apocalyptic number.

66542054 is a deficient number, since it is larger than the sum of its proper divisors (33271030).

66542054 is a wasteful number, since it uses less digits than its factorization.

66542054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33271029.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 66542054 is about 8157.3313038027. The cubic root of 66542054 is about 405.2273356607.

The spelling of 66542054 in words is "sixty-six million, five hundred forty-two thousand, fifty-four".