65540631 has 8 divisors (see below), whose sum is σ = 94109680. Its totient is φ = 40332672.

The previous prime is 65540623. The next prime is 65540647. The reversal of 65540631 is 13604556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65540631 - 2³ = 65540623 is a prime.

It is a super-2 number, since 2×65540631² = 8591148623756322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65540621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 840226 + ... + 840303.

It is an arithmetic number, because the mean of its divisors is an integer number (11763710).

Almost surely, 2^65540631 is an apocalyptic number.

65540631 is a deficient number, since it is larger than the sum of its proper divisors (28569049).

65540631 is a wasteful number, since it uses less digits than its factorization.

65540631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680545.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 65540631 is about 8095.7168305222. The cubic root of 65540631 is about 403.1842323156.

The spelling of 65540631 in words is "sixty-five million, five hundred forty thousand, six hundred thirty-one".