66984951445 has 16 divisors (see below), whose sum is σ = 80785591920. Its totient is φ = 53319168000.

The previous prime is 66984951443. The next prime is 66984951457. The reversal of 66984951445 is 54415948966.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 37110940164 + 29874011281 = 192642^2 + 172841^2 .

It is not a de Polignac number, because 66984951445 - 2¹ = 66984951443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66984951443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1814875 + ... + 1851415.

It is an arithmetic number, because the mean of its divisors is an integer number (5049099495).

Almost surely, 2^66984951445 is an apocalyptic number.

It is an amenable number.

66984951445 is a deficient number, since it is larger than the sum of its proper divisors (13800640475).

66984951445 is a wasteful number, since it uses less digits than its factorization.

66984951445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38376.

The product of its digits is 37324800, while the sum is 61.

The spelling of 66984951445 in words is "sixty-six billion, nine hundred eighty-four million, nine hundred fifty-one thousand, four hundred forty-five".