65620621564 has 12 divisors (see below), whose sum is σ = 118540477888. Its totient is φ = 31751913600.

The previous prime is 65620621531. The next prime is 65620621567. The reversal of 65620621564 is 46512602656.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 65620621564.

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 3 ways as a sum of consecutive naturals, for example, 264599157 + ... + 264599404.

Almost surely, 2^65620621564 is an apocalyptic number.

It is an amenable number.

65620621564 is a deficient number, since it is larger than the sum of its proper divisors (52919856324).

65620621564 is a wasteful number, since it uses less digits than its factorization.

65620621564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529198596 (or 529198594 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 65620621564 in words is "sixty-five billion, six hundred twenty million, six hundred twenty-one thousand, five hundred sixty-four".