646166421254 has 8 divisors (see below), whose sum is σ = 969353422848. Its totient is φ = 323048613640.

The previous prime is 646166421223. The next prime is 646166421283. The reversal of 646166421254 is 452124661646.

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

It is a super-3 number, since 3×646166421254³ (a number of 36 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 646166421199 and 646166421208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17275142 + ... + 17312505.

It is an arithmetic number, because the mean of its divisors is an integer number (121169177856).

Almost surely, 2^646166421254 is an apocalyptic number.

646166421254 is a deficient number, since it is larger than the sum of its proper divisors (323187001594).

646166421254 is a wasteful number, since it uses less digits than its factorization.

646166421254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34596990.

The product of its digits is 1658880, while the sum is 47.

The spelling of 646166421254 in words is "six hundred forty-six billion, one hundred sixty-six million, four hundred twenty-one thousand, two hundred fifty-four".