1966277256481 has 16 divisors (see below), whose sum is σ = 2006979282000. Its totient is φ = 1925711843328.

The previous prime is 1966277256473. The next prime is 1966277256491. The reversal of 1966277256481 is 1846527726691.

It can be written as a sum of positive squares in 8 ways, for example, as 13927776256 + 1952349480225 = 118016^2 + 1397265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966277256481 - 2³ = 1966277256473 is a prime.

It is a super-2 number, since 2×1966277256481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966277256401) 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, 69345495 + ... + 69373843.

It is an arithmetic number, because the mean of its divisors is an integer number (125436205125).

Almost surely, 2^{1966277256481} is an apocalyptic number.

It is an amenable number.

1966277256481 is a deficient number, since it is larger than the sum of its proper divisors (40702025519).

1966277256481 is a wasteful number, since it uses less digits than its factorization.

1966277256481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30708.

The product of its digits is 60963840, while the sum is 64.

The spelling of 1966277256481 in words is "one trillion, nine hundred sixty-six billion, two hundred seventy-seven million, two hundred fifty-six thousand, four hundred eighty-one".