66047331 has 32 divisors (see below), whose sum is σ = 104186880. Its totient is φ = 36429696.

The previous prime is 66047309. The next prime is 66047339. The reversal of 66047331 is 13374066.

It is not a de Polignac number, because 66047331 - 2¹³ = 66039139 is a prime.

It is a super-2 number, since 2×66047331² = 8724499864447122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66047339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129505 + ... + 130013.

It is an arithmetic number, because the mean of its divisors is an integer number (3255840).

Almost surely, 2^66047331 is an apocalyptic number.

66047331 is a deficient number, since it is larger than the sum of its proper divisors (38139549).

66047331 is a wasteful number, since it uses less digits than its factorization.

66047331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723.

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 66047331 is about 8126.9509042445. The cubic root of 66047331 is about 404.2205829844.

The spelling of 66047331 in words is "sixty-six million, forty-seven thousand, three hundred thirty-one".