66931361 has 4 divisors (see below), whose sum is σ = 76492992. Its totient is φ = 57369732.

The previous prime is 66931351. The next prime is 66931399. The reversal of 66931361 is 16313966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66931361 - 2¹⁰ = 66930337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66931301) 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, 4780805 + ... + 4780818.

It is an arithmetic number, because the mean of its divisors is an integer number (19123248).

Almost surely, 2^66931361 is an apocalyptic number.

It is an amenable number.

66931361 is a deficient number, since it is larger than the sum of its proper divisors (9561631).

66931361 is an equidigital number, since it uses as much as digits as its factorization.

66931361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9561630.

The product of its digits is 17496, while the sum is 35.

The square root of 66931361 is about 8181.1589032361. The cubic root of 66931361 is about 406.0160658384.

The spelling of 66931361 in words is "sixty-six million, nine hundred thirty-one thousand, three hundred sixty-one".