643462304631 has 16 divisors (see below), whose sum is σ = 884296401408. Its totient is φ = 415999634400.

The previous prime is 643462304567. The next prime is 643462304659. The reversal of 643462304631 is 136403264346.

It is a happy number.

It is not a de Polignac number, because 643462304631 - 2⁶ = 643462304567 is a prime.

It is a super-2 number, since 2×643462304631² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643462304131) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 24748891 + ... + 24774876.

It is an arithmetic number, because the mean of its divisors is an integer number (55268525088).

Almost surely, 2^643462304631 is an apocalyptic number.

643462304631 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

643462304631 is a deficient number, since it is larger than the sum of its proper divisors (240834096777).

643462304631 is a wasteful number, since it uses less digits than its factorization.

643462304631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49523902.

The product of its (nonzero) digits is 746496, while the sum is 42.

Adding to 643462304631 its reverse (136403264346), we get a palindrome (779865568977).

The spelling of 643462304631 in words is "six hundred forty-three billion, four hundred sixty-two million, three hundred four thousand, six hundred thirty-one".