66719650725 has 144 divisors (see below), whose sum is σ = 153545797440. Its totient is φ = 28154044800.

The previous prime is 66719650691. The next prime is 66719650783. The reversal of 66719650725 is 52705691766.

66719650725 is a `hidden beast` number, since 66 + 71 + 9 + 6 + 507 + 2 + 5 = 666.

66719650725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66719650725 - 2⁷ = 66719650597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 352390 + ... + 507560.

It is an arithmetic number, because the mean of its divisors is an integer number (1066290260).

Almost surely, 2^66719650725 is an apocalyptic number.

66719650725 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66719650725 is an abundant number, since it is smaller than the sum of its proper divisors (86826146715).

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

66719650725 is a wasteful number, since it uses less digits than its factorization.

66719650725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155217 (or 155199 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 54.

The spelling of 66719650725 in words is "sixty-six billion, seven hundred nineteen million, six hundred fifty thousand, seven hundred twenty-five".