66288550 has 12 divisors (see below), whose sum is σ = 123296796. Its totient is φ = 26515400.

The previous prime is 66288529. The next prime is 66288557. The reversal of 66288550 is 5588266.

It is a super-2 number, since 2×66288550² = 8788343722205000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66288557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 662836 + ... + 662935.

It is an arithmetic number, because the mean of its divisors is an integer number (10274733).

Almost surely, 2^66288550 is an apocalyptic number.

66288550 is a deficient number, since it is larger than the sum of its proper divisors (57008246).

66288550 is a wasteful number, since it uses less digits than its factorization.

66288550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325783 (or 1325778 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 66288550 is about 8141.7780613328. The cubic root of 66288550 is about 404.7120851628.

The spelling of 66288550 in words is "sixty-six million, two hundred eighty-eight thousand, five hundred fifty".