69520840981 has 2 divisors, whose sum is σ = 69520840982. Its totient is φ = 69520840980.

The previous prime is 69520840979. The next prime is 69520840999. The reversal of 69520840981 is 18904802596.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57772448881 + 11748392100 = 240359^2 + 108390^2 .

It is a cyclic number.

It is not a de Polignac number, because 69520840981 - 2¹ = 69520840979 is a prime.

It is a super-2 number, since 2×69520840981² (a number of 22 digits) contains 22 as substring.

Together with 69520840979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69520840931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34760420490 + 34760420491.

It is an arithmetic number, because the mean of its divisors is an integer number (34760420491).

Almost surely, 2^69520840981 is an apocalyptic number.

It is an amenable number.

69520840981 is a deficient number, since it is larger than the sum of its proper divisors (1).

69520840981 is an equidigital number, since it uses as much as digits as its factorization.

69520840981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 69520840981 in words is "sixty-nine billion, five hundred twenty million, eight hundred forty thousand, nine hundred eighty-one".