68651090400640 has 128 divisors (see below), whose sum is σ = 183405727038240. Its totient is φ = 24355153920000.

The previous prime is 68651090400631. The next prime is 68651090400647. The reversal of 68651090400640 is 4600409015686.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68651090400647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118633011 + ... + 119210290.

Almost surely, 2^{68651090400640} is an apocalyptic number.

It is an amenable number.

68651090400640 is an abundant number, since it is smaller than the sum of its proper divisors (114754636637600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68651090400640 is a wasteful number, since it uses less digits than its factorization.

68651090400640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237843372 (or 237843360 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 68651090400640 in words is "sixty-eight trillion, six hundred fifty-one billion, ninety million, four hundred thousand, six hundred forty".