66961608 has 32 divisors (see below), whose sum is σ = 191319360. Its totient is φ = 19131840.

The previous prime is 66961603. The next prime is 66961619. The reversal of 66961608 is 80616966.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 66961608.

It is not an unprimeable number, because it can be changed into a prime (66961603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199123 + ... + 199458.

It is an arithmetic number, because the mean of its divisors is an integer number (5978730).

Almost surely, 2^66961608 is an apocalyptic number.

It is an amenable number.

66961608 is an abundant number, since it is smaller than the sum of its proper divisors (124357752).

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

66961608 is a wasteful number, since it uses less digits than its factorization.

66961608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398597 (or 398593 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 66961608 is about 8183.0072711687. The cubic root of 66961608 is about 406.0772176328.

The spelling of 66961608 in words is "sixty-six million, nine hundred sixty-one thousand, six hundred eight".