66434375400 has 48 divisors (see below), whose sum is σ = 205946565600. Its totient is φ = 17715833280.

The previous prime is 66434375389. The next prime is 66434375411. The reversal of 66434375400 is 457343466.

It is an interprime number because it is at equal distance from previous prime (66434375389) and next prime (66434375411).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55361380 + ... + 55362579.

It is an arithmetic number, because the mean of its divisors is an integer number (4290553450).

Almost surely, 2^66434375400 is an apocalyptic number.

66434375400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66434375400 is an abundant number, since it is smaller than the sum of its proper divisors (139512190200).

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

66434375400 is a wasteful number, since it uses less digits than its factorization.

66434375400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110723978 (or 110723969 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 42.

The spelling of 66434375400 in words is "sixty-six billion, four hundred thirty-four million, three hundred seventy-five thousand, four hundred".