66250901720 has 32 divisors (see below), whose sum is σ = 149618696400. Its totient is φ = 26401842048.

The previous prime is 66250901719. The next prime is 66250901723. The reversal of 66250901720 is 2710905266.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66250901723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3067814 + ... + 3089333.

Almost surely, 2^66250901720 is an apocalyptic number.

It is an amenable number.

66250901720 is an abundant number, since it is smaller than the sum of its proper divisors (83367794680).

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

66250901720 is a wasteful number, since it uses less digits than its factorization.

66250901720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6157427 (or 6157423 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The spelling of 66250901720 in words is "sixty-six billion, two hundred fifty million, nine hundred one thousand, seven hundred twenty".