66400025355352 has 32 divisors (see below), whose sum is σ = 134077311002880. Its totient is φ = 30646088582400.

The previous prime is 66400025355347. The next prime is 66400025355383. The reversal of 66400025355352 is 25355352000466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76116852 + ... + 76984252.

It is an arithmetic number, because the mean of its divisors is an integer number (4189915968840).

Almost surely, 2^{66400025355352} is an apocalyptic number.

It is an amenable number.

66400025355352 is an abundant number, since it is smaller than the sum of its proper divisors (67677285647528).

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

66400025355352 is a wasteful number, since it uses less digits than its factorization.

66400025355352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603483 (or 1603479 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 46.

The spelling of 66400025355352 in words is "sixty-six trillion, four hundred billion, twenty-five million, three hundred fifty-five thousand, three hundred fifty-two".