65401656541 has 4 divisors (see below), whose sum is σ = 70432553212. Its totient is φ = 60370759872.

The previous prime is 65401656511. The next prime is 65401656563. The reversal of 65401656541 is 14565610456.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14969522500 + 50432134041 = 122350^2 + 224571^2 .

It is a cyclic number.

It is not a de Polignac number, because 65401656541 - 2⁷ = 65401656413 is a prime.

It is a super-3 number, since 3×65401656541³ (a number of 33 digits) contains 333 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 (65401656511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2515448316 + ... + 2515448341.

It is an arithmetic number, because the mean of its divisors is an integer number (17608138303).

Almost surely, 2^65401656541 is an apocalyptic number.

It is an amenable number.

65401656541 is a deficient number, since it is larger than the sum of its proper divisors (5030896671).

65401656541 is a wasteful number, since it uses less digits than its factorization.

65401656541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5030896670.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 65401656541 in words is "sixty-five billion, four hundred one million, six hundred fifty-six thousand, five hundred forty-one".