646524766 has 4 divisors (see below), whose sum is σ = 969787152. Its totient is φ = 323262382.

The previous prime is 646524763. The next prime is 646524797. The reversal of 646524766 is 667425646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 667425646 = 2 ⋅333712823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646524763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161631190 + ... + 161631193.

It is an arithmetic number, because the mean of its divisors is an integer number (242446788).

Almost surely, 2^646524766 is an apocalyptic number.

646524766 is a deficient number, since it is larger than the sum of its proper divisors (323262386).

646524766 is a wasteful number, since it uses less digits than its factorization.

646524766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323262385.

The product of its digits is 1451520, while the sum is 46.

The square root of 646524766 is about 25426.8512797004. The cubic root of 646524766 is about 864.6925593907.

The spelling of 646524766 in words is "six hundred forty-six million, five hundred twenty-four thousand, seven hundred sixty-six".