66661546 has 16 divisors (see below), whose sum is σ = 118218240. Its totient is φ = 27583920.

The previous prime is 66661541. The next prime is 66661547. The reversal of 66661546 is 64516666.

It is a super-2 number, since 2×66661546² = 8887523430220232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66661499 and 66661508.

It is not an unprimeable number, because it can be changed into a prime (66661541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81690 + ... + 82501.

It is an arithmetic number, because the mean of its divisors is an integer number (7388640).

Almost surely, 2^66661546 is an apocalyptic number.

66661546 is a deficient number, since it is larger than the sum of its proper divisors (51556694).

66661546 is a wasteful number, since it uses less digits than its factorization.

66661546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164229.

The product of its digits is 155520, while the sum is 40.

The square root of 66661546 is about 8164.6522277437. The cubic root of 66661546 is about 405.4697511294.

The spelling of 66661546 in words is "sixty-six million, six hundred sixty-one thousand, five hundred forty-six".