6277619981 has 2 divisors, whose sum is σ = 6277619982. Its totient is φ = 6277619980.

The previous prime is 6277619899. The next prime is 6277619987. The reversal of 6277619981 is 1899167726.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4915271881 + 1362348100 = 70109^2 + 36910^2 .

It is a cyclic number.

It is not a de Polignac number, because 6277619981 - 2¹⁰ = 6277618957 is a prime.

It is a super-2 number, since 2×6277619981² = 78817025251700880722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6277619987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3138809990 + 3138809991.

It is an arithmetic number, because the mean of its divisors is an integer number (3138809991).

Almost surely, 2^6277619981 is an apocalyptic number.

It is an amenable number.

6277619981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6277619981 is an equidigital number, since it uses as much as digits as its factorization.

6277619981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 56.

The square root of 6277619981 is about 79231.4330363903. The cubic root of 6277619981 is about 1844.7251722065.

The spelling of 6277619981 in words is "six billion, two hundred seventy-seven million, six hundred nineteen thousand, nine hundred eighty-one".