65621061688979 has 2 divisors, whose sum is σ = 65621061688980. Its totient is φ = 65621061688978.

The previous prime is 65621061688939. The next prime is 65621061688991. The reversal of 65621061688979 is 97988616012656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65621061688979 - 2⁸ = 65621061688723 is a prime.

It is a super-2 number, since 2×65621061688979² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65621061688939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32810530844489 + 32810530844490.

It is an arithmetic number, because the mean of its divisors is an integer number (32810530844490).

Almost surely, 2^{65621061688979} is an apocalyptic number.

65621061688979 is a deficient number, since it is larger than the sum of its proper divisors (1).

65621061688979 is an equidigital number, since it uses as much as digits as its factorization.

65621061688979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 470292480, while the sum is 74.

The spelling of 65621061688979 in words is "sixty-five trillion, six hundred twenty-one billion, sixty-one million, six hundred eighty-eight thousand, nine hundred seventy-nine".