66251301240 has 64 divisors (see below), whose sum is σ = 199047728160. Its totient is φ = 17640896000.

The previous prime is 66251301223. The next prime is 66251301253. The reversal of 66251301240 is 4210315266.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 66251301198 and 66251301207.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 326511 + ... + 488990.

Almost surely, 2^66251301240 is an apocalyptic number.

66251301240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66251301240 is an abundant number, since it is smaller than the sum of its proper divisors (132796426920).

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

66251301240 is a wasteful number, since it uses less digits than its factorization.

66251301240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816192 (or 816188 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 66251301240 in words is "sixty-six billion, two hundred fifty-one million, three hundred one thousand, two hundred forty".