666753620 has 48 divisors (see below), whose sum is σ = 1509934608. Its totient is φ = 245852160.

The previous prime is 666753599. The next prime is 666753641. The reversal of 666753620 is 26357666.

It is an interprime number because it is at equal distance from previous prime (666753599) and next prime (666753641).

It can be written as a sum of positive squares in 8 ways, for example, as 10471696 + 656281924 = 3236^2 + 25618^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274652 + ... + 277068.

It is an arithmetic number, because the mean of its divisors is an integer number (31456971).

Almost surely, 2^666753620 is an apocalyptic number.

It is an amenable number.

666753620 is an abundant number, since it is smaller than the sum of its proper divisors (843180988).

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

666753620 is a wasteful number, since it uses less digits than its factorization.

666753620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500 (or 3498 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 41.

The square root of 666753620 is about 25821.5727638732. The cubic root of 666753620 is about 873.6184434518.

The spelling of 666753620 in words is "six hundred sixty-six million, seven hundred fifty-three thousand, six hundred twenty".