65681494 has 4 divisors (see below), whose sum is σ = 98522244. Its totient is φ = 32840746.

The previous prime is 65681477. The next prime is 65681503. The reversal of 65681494 is 49418656.

It is a semiprime because it is the product of two primes.

It is a super-4 number, since 4×65681494⁴ (a number of 32 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65681494.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16420372 + ... + 16420375.

It is an arithmetic number, because the mean of its divisors is an integer number (24630561).

Almost surely, 2^65681494 is an apocalyptic number.

65681494 is a deficient number, since it is larger than the sum of its proper divisors (32840750).

65681494 is a wasteful number, since it uses less digits than its factorization.

65681494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32840749.

The product of its digits is 207360, while the sum is 43.

The square root of 65681494 is about 8104.4120082829. The cubic root of 65681494 is about 403.4728731187.

The spelling of 65681494 in words is "sixty-five million, six hundred eighty-one thousand, four hundred ninety-four".