643698399962 has 4 divisors (see below), whose sum is σ = 965547599946. Its totient is φ = 321849199980.

The previous prime is 643698399923. The next prime is 643698399977. The reversal of 643698399962 is 269993896346.

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., 589315693561 + 54382706401 = 767669^2 + 233201^2 .

It is a super-2 number, since 2×643698399962² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643698399962.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160924599989 + ... + 160924599992.

Almost surely, 2^643698399962 is an apocalyptic number.

643698399962 is a deficient number, since it is larger than the sum of its proper divisors (321849199984).

643698399962 is a wasteful number, since it uses less digits than its factorization.

643698399962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321849199983.

The product of its digits is 816293376, while the sum is 74.

The spelling of 643698399962 in words is "six hundred forty-three billion, six hundred ninety-eight million, three hundred ninety-nine thousand, nine hundred sixty-two".