1977685466 has 8 divisors (see below), whose sum is σ = 2967297300. Its totient is φ = 988586368.

The previous prime is 1977685439. The next prime is 1977685477. The reversal of 1977685466 is 6645867791.

It can be written as a sum of positive squares in 2 ways, for example, as 1977669841 + 15625 = 44471^2 + 125^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×1977685466³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118391 + ... + 134058.

Almost surely, 2^1977685466 is an apocalyptic number.

1977685466 is a deficient number, since it is larger than the sum of its proper divisors (989611834).

1977685466 is a wasteful number, since it uses less digits than its factorization.

1977685466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256368.

The product of its digits is 15240960, while the sum is 59.

The square root of 1977685466 is about 44471.1756759364. The cubic root of 1977685466 is about 1255.2177557949.

The spelling of 1977685466 in words is "one billion, nine hundred seventy-seven million, six hundred eighty-five thousand, four hundred sixty-six".