65970981 has 12 divisors (see below), whose sum is σ = 95485260. Its totient is φ = 43891200.

The previous prime is 65970977. The next prime is 65970997. The reversal of 65970981 is 18907956.

It can be written as a sum of positive squares in 2 ways, for example, as 62489025 + 3481956 = 7905^2 + 1866^2 .

It is not a de Polignac number, because 65970981 - 2² = 65970977 is a prime.

It is a super-2 number, since 2×65970981² = 8704340668204722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65970941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2620 + ... + 11781.

It is an arithmetic number, because the mean of its divisors is an integer number (7957105).

Almost surely, 2^65970981 is an apocalyptic number.

It is an amenable number.

65970981 is a deficient number, since it is larger than the sum of its proper divisors (29514279).

65970981 is a wasteful number, since it uses less digits than its factorization.

65970981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14916 (or 14913 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 65970981 is about 8122.2522122869. The cubic root of 65970981 is about 404.0647647208.

The spelling of 65970981 in words is "sixty-five million, nine hundred seventy thousand, nine hundred eighty-one".