648943693988 has 24 divisors (see below), whose sum is σ = 1188796460544. Its totient is φ = 309582403200.

The previous prime is 648943693987. The next prime is 648943694023. The reversal of 648943693988 is 889396349846.

It is a super-2 number, since 2×648943693988² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (648943693987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36846245 + ... + 36863852.

It is an arithmetic number, because the mean of its divisors is an integer number (49533185856).

Almost surely, 2^648943693988 is an apocalyptic number.

It is an amenable number.

648943693988 is a deficient number, since it is larger than the sum of its proper divisors (539852766556).

648943693988 is a wasteful number, since it uses less digits than its factorization.

648943693988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73710203 (or 73710201 counting only the distinct ones).

The product of its digits is 1934917632, while the sum is 77.

The spelling of 648943693988 in words is "six hundred forty-eight billion, nine hundred forty-three million, six hundred ninety-three thousand, nine hundred eighty-eight".