65621321545 has 16 divisors (see below), whose sum is σ = 84944563200. Its totient is φ = 48377893824.

The previous prime is 65621321501. The next prime is 65621321587. The reversal of 65621321545 is 54512312656.

It is not a de Polignac number, because 65621321545 - 2¹¹ = 65621319497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65621321498 and 65621321507.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 803769 + ... + 881638.

It is an arithmetic number, because the mean of its divisors is an integer number (5309035200).

Almost surely, 2^65621321545 is an apocalyptic number.

65621321545 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

65621321545 is a deficient number, since it is larger than the sum of its proper divisors (19323241655).

65621321545 is a wasteful number, since it uses less digits than its factorization.

65621321545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686024.

The product of its digits is 216000, while the sum is 40.

The spelling of 65621321545 in words is "sixty-five billion, six hundred twenty-one million, three hundred twenty-one thousand, five hundred forty-five".