65406081 has 16 divisors (see below), whose sum is σ = 95691456. Its totient is φ = 39489216.

The previous prime is 65406067. The next prime is 65406101. The reversal of 65406081 is 18060456.

It is not a de Polignac number, because 65406081 - 2⁶ = 65406017 is a prime.

It is a super-2 number, since 2×65406081² = 8555910863557122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65406031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13755 + ... + 17888.

It is an arithmetic number, because the mean of its divisors is an integer number (5980716).

Almost surely, 2^65406081 is an apocalyptic number.

It is an amenable number.

65406081 is a deficient number, since it is larger than the sum of its proper divisors (30285375).

65406081 is a wasteful number, since it uses less digits than its factorization.

65406081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31712.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 65406081 is about 8087.4026114693. The cubic root of 65406081 is about 402.9081409674.

It can be divided in two parts, 6540 and 6081, that added together give a palindrome (12621).

The spelling of 65406081 in words is "sixty-five million, four hundred six thousand, eighty-one".