66542752250 has 32 divisors (see below), whose sum is σ = 134150195088. Its totient is φ = 24569630400.

The previous prime is 66542752249. The next prime is 66542752253. The reversal of 66542752250 is 5225724566.

It can be written as a sum of positive squares in 8 ways, for example, as 8793375529 + 57749376721 = 93773^2 + 240311^2 .

It is not an unprimeable number, because it can be changed into a prime (66542752253) 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, 10234097 + ... + 10240596.

Almost surely, 2^66542752250 is an apocalyptic number.

66542752250 is an abundant number, since it is smaller than the sum of its proper divisors (67607442838).

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

66542752250 is a wasteful number, since it uses less digits than its factorization.

66542752250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20474723 (or 20474713 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 44.

The spelling of 66542752250 in words is "sixty-six billion, five hundred forty-two million, seven hundred fifty-two thousand, two hundred fifty".