66713635 has 4 divisors (see below), whose sum is σ = 80056368. Its totient is φ = 53370904.

The previous prime is 66713587. The next prime is 66713641. The reversal of 66713635 is 53631766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53631766 = 2 ⋅26815883.

It is a cyclic number.

It is not a de Polignac number, because 66713635 - 2²³ = 58325027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66713594 and 66713603.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6671359 + ... + 6671368.

It is an arithmetic number, because the mean of its divisors is an integer number (20014092).

Almost surely, 2^66713635 is an apocalyptic number.

66713635 is a deficient number, since it is larger than the sum of its proper divisors (13342733).

66713635 is a wasteful number, since it uses less digits than its factorization.

66713635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13342732.

The product of its digits is 68040, while the sum is 37.

The square root of 66713635 is about 8167.8415141333. The cubic root of 66713635 is about 405.5753343147.

The spelling of 66713635 in words is "sixty-six million, seven hundred thirteen thousand, six hundred thirty-five".