7661437919 has 2 divisors, whose sum is σ = 7661437920. Its totient is φ = 7661437918.

The previous prime is 7661437909. The next prime is 7661437939. The reversal of 7661437919 is 9197341667.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7661437919 is a prime.

It is a super-2 number, since 2×7661437919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7661437909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3830718959 + 3830718960.

It is an arithmetic number, because the mean of its divisors is an integer number (3830718960).

Almost surely, 2^7661437919 is an apocalyptic number.

7661437919 is a deficient number, since it is larger than the sum of its proper divisors (1).

7661437919 is an equidigital number, since it uses as much as digits as its factorization.

7661437919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 53.

The square root of 7661437919 is about 87529.6402311811. The cubic root of 7661437919 is about 1971.3788622849.

The spelling of 7661437919 in words is "seven billion, six hundred sixty-one million, four hundred thirty-seven thousand, nine hundred nineteen".