1977166477 has 8 divisors (see below), whose sum is σ = 2322825120. Its totient is φ = 1659160560.

The previous prime is 1977166421. The next prime is 1977166501. The reversal of 1977166477 is 7746617791.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1977166477 - 2⁷ = 1977166349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977146477) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6913027 + ... + 6913312.

It is an arithmetic number, because the mean of its divisors is an integer number (290353140).

Almost surely, 2^1977166477 is an apocalyptic number.

It is an amenable number.

1977166477 is a deficient number, since it is larger than the sum of its proper divisors (345658643).

1977166477 is a wasteful number, since it uses less digits than its factorization.

1977166477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13826363.

The product of its digits is 3111696, while the sum is 55.

The square root of 1977166477 is about 44465.3401763666. The cubic root of 1977166477 is about 1255.1079470965.

The spelling of 1977166477 in words is "one billion, nine hundred seventy-seven million, one hundred sixty-six thousand, four hundred seventy-seven".