65620621565 has 16 divisors (see below), whose sum is σ = 80963076096. Its totient is φ = 51027062400.

The previous prime is 65620621531. The next prime is 65620621567. The reversal of 65620621565 is 56512602656.

It is not a de Polignac number, because 65620621565 - 2⁶ = 65620621501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65620621567) 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, 535037 + ... + 646146.

It is an arithmetic number, because the mean of its divisors is an integer number (5060192256).

Almost surely, 2^65620621565 is an apocalyptic number.

It is an amenable number.

65620621565 is a deficient number, since it is larger than the sum of its proper divisors (15342454531).

65620621565 is a wasteful number, since it uses less digits than its factorization.

65620621565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181500.

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 65620621565 in words is "sixty-five billion, six hundred twenty million, six hundred twenty-one thousand, five hundred sixty-five".