77166421 has 8 divisors (see below), whose sum is σ = 78451200. Its totient is φ = 75887280.

The previous prime is 77166407. The next prime is 77166461. The reversal of 77166421 is 12466177.

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 77166421 - 2⁵ = 77166389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77166461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32875 + ... + 35143.

It is an arithmetic number, because the mean of its divisors is an integer number (9806400).

Almost surely, 2^77166421 is an apocalyptic number.

77166421 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

77166421 is a deficient number, since it is larger than the sum of its proper divisors (1284779).

77166421 is a wasteful number, since it uses less digits than its factorization.

77166421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819.

The product of its digits is 14112, while the sum is 34.

The square root of 77166421 is about 8784.4419856927. The cubic root of 77166421 is about 425.7383630780.

The spelling of 77166421 in words is "seventy-seven million, one hundred sixty-six thousand, four hundred twenty-one".