66361965 has 32 divisors (see below), whose sum is σ = 118350720. Its totient is φ = 31555584.

The previous prime is 66361957. The next prime is 66361987. The reversal of 66361965 is 56916366.

It is not a de Polignac number, because 66361965 - 2³ = 66361957 is a prime.

It is a super-2 number, since 2×66361965² = 8807820797322450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2004 + ... + 11693.

It is an arithmetic number, because the mean of its divisors is an integer number (3698460).

Almost surely, 2^66361965 is an apocalyptic number.

It is an amenable number.

66361965 is a deficient number, since it is larger than the sum of its proper divisors (51988755).

66361965 is a wasteful number, since it uses less digits than its factorization.

66361965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13741.

The product of its digits is 174960, while the sum is 42.

The square root of 66361965 is about 8146.2853497775. The cubic root of 66361965 is about 404.8614371286.

The spelling of 66361965 in words is "sixty-six million, three hundred sixty-one thousand, nine hundred sixty-five".