7945555481 has 2 divisors, whose sum is σ = 7945555482. Its totient is φ = 7945555480.

The previous prime is 7945555463. The next prime is 7945555507. The reversal of 7945555481 is 1845555497.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5038728256 + 2906827225 = 70984^2 + 53915^2 .

It is a cyclic number.

It is not a de Polignac number, because 7945555481 - 2¹⁰ = 7945554457 is a prime.

It is a super-2 number, since 2×7945555481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7945555411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3972777740 + 3972777741.

It is an arithmetic number, because the mean of its divisors is an integer number (3972777741).

Almost surely, 2^7945555481 is an apocalyptic number.

It is an amenable number.

7945555481 is a deficient number, since it is larger than the sum of its proper divisors (1).

7945555481 is an equidigital number, since it uses as much as digits as its factorization.

7945555481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040000, while the sum is 53.

The square root of 7945555481 is about 89137.8453912815. The cubic root of 7945555481 is about 1995.4526252777.

The spelling of 7945555481 in words is "seven billion, nine hundred forty-five million, five hundred fifty-five thousand, four hundred eighty-one".