7140813661 has 2 divisors, whose sum is σ = 7140813662. Its totient is φ = 7140813660.

The previous prime is 7140813607. The next prime is 7140813731. The reversal of 7140813661 is 1663180417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6617822500 + 522991161 = 81350^2 + 22869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7140813661 is a prime.

It is a super-2 number, since 2×7140813661² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7140813661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7140819661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3570406830 + 3570406831.

It is an arithmetic number, because the mean of its divisors is an integer number (3570406831).

Almost surely, 2^7140813661 is an apocalyptic number.

It is an amenable number.

7140813661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7140813661 is an equidigital number, since it uses as much as digits as its factorization.

7140813661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 7140813661 is about 84503.3352063692. The cubic root of 7140813661 is about 1925.6731135456.

The spelling of 7140813661 in words is "seven billion, one hundred forty million, eight hundred thirteen thousand, six hundred sixty-one".