66254561325400 has 144 divisors (see below), whose sum is σ = 179206193350800. Its totient is φ = 22713992743680.

The previous prime is 66254561325373. The next prime is 66254561325431. The reversal of 66254561325400 is 452316545266.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 122396541 + ... + 122936659.

It is an arithmetic number, because the mean of its divisors is an integer number (1244487453825).

Almost surely, 2^{66254561325400} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66254561325400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89603096675400).

66254561325400 is an abundant number, since it is smaller than the sum of its proper divisors (112951632025400).

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

66254561325400 is a wasteful number, since it uses less digits than its factorization.

66254561325400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552666 (or 552650 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 49.

The spelling of 66254561325400 in words is "sixty-six trillion, two hundred fifty-four billion, five hundred sixty-one million, three hundred twenty-five thousand, four hundred".