66697152 has 56 divisors (see below), whose sum is σ = 177125376. Its totient is φ = 22149888.

The previous prime is 66697123. The next prime is 66697159. The reversal of 66697152 is 25179666.

It is a super-2 number, since 2×66697152² = 8897020169822208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66697159) 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, 73083 + ... + 73989.

Almost surely, 2^66697152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66697152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88562688).

66697152 is an abundant number, since it is smaller than the sum of its proper divisors (110428224).

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

66697152 is a wasteful number, since it uses less digits than its factorization.

66697152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305 (or 1295 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The square root of 66697152 is about 8166.8324336918. The cubic root of 66697152 is about 405.5419296048.

The spelling of 66697152 in words is "sixty-six million, six hundred ninety-seven thousand, one hundred fifty-two".