646738151 has 4 divisors (see below), whose sum is σ = 667600704. Its totient is φ = 625875600.

The previous prime is 646738129. The next prime is 646738177. The reversal of 646738151 is 151837646.

646738151 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646738151 - 2⁶ = 646738087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646738099 and 646738108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646738111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10431230 + ... + 10431291.

It is an arithmetic number, because the mean of its divisors is an integer number (166900176).

Almost surely, 2^646738151 is an apocalyptic number.

646738151 is a deficient number, since it is larger than the sum of its proper divisors (20862553).

646738151 is a wasteful number, since it uses less digits than its factorization.

646738151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20862552.

The product of its digits is 120960, while the sum is 41.

The square root of 646738151 is about 25431.0469898508. The cubic root of 646738151 is about 864.7876792973.

The spelling of 646738151 in words is "six hundred forty-six million, seven hundred thirty-eight thousand, one hundred fifty-one".