66963572 has 12 divisors (see below), whose sum is σ = 126200676. Its totient is φ = 30906240.

The previous prime is 66963569. The next prime is 66963577. The reversal of 66963572 is 27536966.

It can be written as a sum of positive squares in 2 ways, for example, as 4648336 + 62315236 = 2156^2 + 7894^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66963577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643829 + ... + 643932.

It is an arithmetic number, because the mean of its divisors is an integer number (10516723).

Almost surely, 2^66963572 is an apocalyptic number.

It is an amenable number.

66963572 is a deficient number, since it is larger than the sum of its proper divisors (59237104).

66963572 is a wasteful number, since it uses less digits than its factorization.

66963572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287778 (or 1287776 counting only the distinct ones).

The product of its digits is 408240, while the sum is 44.

The square root of 66963572 is about 8183.1272750703. The cubic root of 66963572 is about 406.0811877080.

The spelling of 66963572 in words is "sixty-six million, nine hundred sixty-three thousand, five hundred seventy-two".