646122505 has 16 divisors (see below), whose sum is σ = 890711424. Its totient is φ = 440755200.

The previous prime is 646122497. The next prime is 646122539. The reversal of 646122505 is 505221646.

It is not a de Polignac number, because 646122505 - 2³ = 646122497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41071 + ... + 54580.

It is an arithmetic number, because the mean of its divisors is an integer number (55669464).

Almost surely, 2^646122505 is an apocalyptic number.

It is an amenable number.

646122505 is a deficient number, since it is larger than the sum of its proper divisors (244588919).

646122505 is a wasteful number, since it uses less digits than its factorization.

646122505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95856.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 646122505 is about 25418.9398874147. The cubic root of 646122505 is about 864.5131879389.

The spelling of 646122505 in words is "six hundred forty-six million, one hundred twenty-two thousand, five hundred five".