641564746 has 4 divisors (see below), whose sum is σ = 962347122. Its totient is φ = 320782372.

The previous prime is 641564743. The next prime is 641564779. The reversal of 641564746 is 647465146.

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

It can be written as a sum of positive squares in only one way, i.e., 370139121 + 271425625 = 19239^2 + 16475^2 .

It is not an unprimeable number, because it can be changed into a prime (641564741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160391185 + ... + 160391188.

Almost surely, 2^641564746 is an apocalyptic number.

641564746 is a deficient number, since it is larger than the sum of its proper divisors (320782376).

641564746 is a wasteful number, since it uses less digits than its factorization.

641564746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320782375.

The product of its digits is 483840, while the sum is 43.

The square root of 641564746 is about 25329.1284097973. The cubic root of 641564746 is about 862.4756258882.

The spelling of 641564746 in words is "six hundred forty-one million, five hundred sixty-four thousand, seven hundred forty-six".