66546913950 has 576 divisors, whose sum is σ = 215926394112. Its totient is φ = 14508748800.

The previous prime is 66546913949. The next prime is 66546913963. The reversal of 66546913950 is 5931964566.

66546913950 is a `hidden beast` number, since 6 + 6 + 546 + 9 + 1 + 3 + 95 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 191777677 + ... + 191778023.

It is an arithmetic number, because the mean of its divisors is an integer number (374872212).

Almost surely, 2^66546913950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66546913950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107963197056).

66546913950 is an abundant number, since it is smaller than the sum of its proper divisors (149379480162).

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

66546913950 is a wasteful number, since it uses less digits than its factorization.

66546913950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 54.

The spelling of 66546913950 in words is "sixty-six billion, five hundred forty-six million, nine hundred thirteen thousand, nine hundred fifty".