66220654 has 4 divisors (see below), whose sum is σ = 99330984. Its totient is φ = 33110326.

The previous prime is 66220613. The next prime is 66220711. The reversal of 66220654 is 45602266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45602266 = 2 ⋅22801133.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16555162 + ... + 16555165.

It is an arithmetic number, because the mean of its divisors is an integer number (24832746).

Almost surely, 2^66220654 is an apocalyptic number.

66220654 is a deficient number, since it is larger than the sum of its proper divisors (33110330).

66220654 is a wasteful number, since it uses less digits than its factorization.

66220654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33110329.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 66220654 is about 8137.6073879243. The cubic root of 66220654 is about 404.5738626059.

It can be divided in two parts, 662 and 20654, that added together give a square (21316 = 146²).

The spelling of 66220654 in words is "sixty-six million, two hundred twenty thousand, six hundred fifty-four".