61374263981 has 2 divisors, whose sum is σ = 61374263982. Its totient is φ = 61374263980.

The previous prime is 61374263969. The next prime is 61374264011. The reversal of 61374263981 is 18936247316.

61374263981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39437988100 + 21936275881 = 198590^2 + 148109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61374263981 is a prime.

It is a super-2 number, since 2×61374263981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61374263921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30687131990 + 30687131991.

It is an arithmetic number, because the mean of its divisors is an integer number (30687131991).

Almost surely, 2^61374263981 is an apocalyptic number.

It is an amenable number.

61374263981 is a deficient number, since it is larger than the sum of its proper divisors (1).

61374263981 is an equidigital number, since it uses as much as digits as its factorization.

61374263981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The spelling of 61374263981 in words is "sixty-one billion, three hundred seventy-four million, two hundred sixty-three thousand, nine hundred eighty-one".