61852885981 has 2 divisors, whose sum is σ = 61852885982. Its totient is φ = 61852885980.

The previous prime is 61852885979. The next prime is 61852886027. The reversal of 61852885981 is 18958825816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61784559225 + 68326756 = 248565^2 + 8266^2 .

It is a cyclic number.

It is not a de Polignac number, because 61852885981 - 2¹ = 61852885979 is a prime.

It is a super-2 number, since 2×61852885981² (a number of 22 digits) contains 22 as substring.

Together with 61852885979, 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 (61852885481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30926442990 + 30926442991.

It is an arithmetic number, because the mean of its divisors is an integer number (30926442991).

Almost surely, 2^61852885981 is an apocalyptic number.

It is an amenable number.

61852885981 is a deficient number, since it is larger than the sum of its proper divisors (1).

61852885981 is an equidigital number, since it uses as much as digits as its factorization.

61852885981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11059200, while the sum is 61.

The spelling of 61852885981 in words is "sixty-one billion, eight hundred fifty-two million, eight hundred eighty-five thousand, nine hundred eighty-one".