7771980061 has 2 divisors, whose sum is σ = 7771980062. Its totient is φ = 7771980060.

The previous prime is 7771980043. The next prime is 7771980079. The reversal of 7771980061 is 1600891777.

It is a balanced prime because it is at equal distance from previous prime (7771980043) and next prime (7771980079).

It can be written as a sum of positive squares in only one way, i.e., 6475259961 + 1296720100 = 80469^2 + 36010^2 .

It is an emirp because it is prime and its reverse (1600891777) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7771980061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7771979993 and 7771980020.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7771980361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3885990030 + 3885990031.

It is an arithmetic number, because the mean of its divisors is an integer number (3885990031).

Almost surely, 2^7771980061 is an apocalyptic number.

It is an amenable number.

7771980061 is a deficient number, since it is larger than the sum of its proper divisors (1).

7771980061 is an equidigital number, since it uses as much as digits as its factorization.

7771980061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 148176, while the sum is 46.

The square root of 7771980061 is about 88158.8342765488. The cubic root of 7771980061 is about 1980.8148926981.

The spelling of 7771980061 in words is "seven billion, seven hundred seventy-one million, nine hundred eighty thousand, sixty-one".