65621540851 has 4 divisors (see below), whose sum is σ = 65665495152. Its totient is φ = 65577586552.

The previous prime is 65621540849. The next prime is 65621540857. The reversal of 65621540851 is 15804512656.

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

It is a cyclic number.

It is not a de Polignac number, because 65621540851 - 2¹ = 65621540849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65621540798 and 65621540807.

It is not an unprimeable number, because it can be changed into a prime (65621540857) 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, 21974911 + ... + 21977896.

It is an arithmetic number, because the mean of its divisors is an integer number (16416373788).

Almost surely, 2^65621540851 is an apocalyptic number.

65621540851 is a deficient number, since it is larger than the sum of its proper divisors (43954301).

65621540851 is a wasteful number, since it uses less digits than its factorization.

65621540851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43954300.

The product of its (nonzero) digits is 288000, while the sum is 43.

The spelling of 65621540851 in words is "sixty-five billion, six hundred twenty-one million, five hundred forty thousand, eight hundred fifty-one".