66051554 has 4 divisors (see below), whose sum is σ = 99077334. Its totient is φ = 33025776.

The previous prime is 66051547. The next prime is 66051571. The reversal of 66051554 is 45515066.

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

It can be written as a sum of positive squares in only one way, i.e., 39250225 + 26801329 = 6265^2 + 5177^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66051554.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16512887 + ... + 16512890.

Almost surely, 2^66051554 is an apocalyptic number.

66051554 is a deficient number, since it is larger than the sum of its proper divisors (33025780).

66051554 is a wasteful number, since it uses less digits than its factorization.

66051554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33025779.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 66051554 is about 8127.2107146302. The cubic root of 66051554 is about 404.2291979535.

The spelling of 66051554 in words is "sixty-six million, fifty-one thousand, five hundred fifty-four".