1666962977 has 6 divisors (see below), whose sum is σ = 1675506678. Its totient is φ = 1658462624.

The previous prime is 1666962971. The next prime is 1666962991. The reversal of 1666962977 is 7792696661.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 795296401 + 871666576 = 28201^2 + 29524^2 .

It is not a de Polignac number, because 1666962977 - 2¹⁰ = 1666961953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666962971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17333 + ... + 60285.

It is an arithmetic number, because the mean of its divisors is an integer number (279251113).

Almost surely, 2^1666962977 is an apocalyptic number.

It is an amenable number.

1666962977 is a deficient number, since it is larger than the sum of its proper divisors (8543701).

1666962977 is an frugal number, since it uses more digits than its factorization.

1666962977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43347 (or 43150 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 59.

The square root of 1666962977 is about 40828.4579307130. The cubic root of 1666962977 is about 1185.7013602826.

The spelling of 1666962977 in words is "one billion, six hundred sixty-six million, nine hundred sixty-two thousand, nine hundred seventy-seven".