66361247 has 8 divisors (see below), whose sum is σ = 69264720. Its totient is φ = 63519040.

The previous prime is 66361237. The next prime is 66361249. The reversal of 66361247 is 74216366.

66361247 = 289² + 290² + ... + 606².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66361247 - 2⁸ = 66360991 is a prime.

It is a super-4 number, since 4×66361247⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66361249) 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, 13097 + ... + 17442.

It is an arithmetic number, because the mean of its divisors is an integer number (8658090).

Almost surely, 2^66361247 is an apocalyptic number.

66361247 is a deficient number, since it is larger than the sum of its proper divisors (2903473).

66361247 is a wasteful number, since it uses less digits than its factorization.

66361247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30633.

The product of its digits is 36288, while the sum is 35.

The square root of 66361247 is about 8146.2412804925. The cubic root of 66361247 is about 404.8599769972.

The spelling of 66361247 in words is "sixty-six million, three hundred sixty-one thousand, two hundred forty-seven".