7060665721 has 2 divisors, whose sum is σ = 7060665722. Its totient is φ = 7060665720.

The previous prime is 7060665713. The next prime is 7060665737. The reversal of 7060665721 is 1275660607.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6199830121 + 860835600 = 78739^2 + 29340^2 .

It is a cyclic number.

It is not a de Polignac number, because 7060665721 - 2³ = 7060665713 is a prime.

It is not a weakly prime, because it can be changed into another prime (7060660721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3530332860 + 3530332861.

It is an arithmetic number, because the mean of its divisors is an integer number (3530332861).

Almost surely, 2^7060665721 is an apocalyptic number.

It is an amenable number.

7060665721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7060665721 is an equidigital number, since it uses as much as digits as its factorization.

7060665721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 7060665721 is about 84027.7675593015. The cubic root of 7060665721 is about 1918.4414544792.

The spelling of 7060665721 in words is "seven billion, sixty million, six hundred sixty-five thousand, seven hundred twenty-one".