646464261242 has 4 divisors (see below), whose sum is σ = 969696391866. Its totient is φ = 323232130620.

The previous prime is 646464261229. The next prime is 646464261251. The reversal of 646464261242 is 242162464646.

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., 616521765721 + 29942495521 = 785189^2 + 173039^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161616065309 + ... + 161616065312.

Almost surely, 2^646464261242 is an apocalyptic number.

646464261242 is a deficient number, since it is larger than the sum of its proper divisors (323232130624).

646464261242 is a wasteful number, since it uses less digits than its factorization.

646464261242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323232130623.

The product of its digits is 2654208, while the sum is 47.

The spelling of 646464261242 in words is "six hundred forty-six billion, four hundred sixty-four million, two hundred sixty-one thousand, two hundred forty-two".