7611968721 has 16 divisors (see below), whose sum is σ = 11795788800. Its totient is φ = 4275972048.

The previous prime is 7611968713. The next prime is 7611968729. The reversal of 7611968721 is 1278691167.

It is an interprime number because it is at equal distance from previous prime (7611968713) and next prime (7611968729).

It is not a de Polignac number, because 7611968721 - 2³ = 7611968713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7611968729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3070581 + ... + 3073058.

It is an arithmetic number, because the mean of its divisors is an integer number (737236800).

Almost surely, 2^7611968721 is an apocalyptic number.

It is an amenable number.

7611968721 is a deficient number, since it is larger than the sum of its proper divisors (4183820079).

7611968721 is a wasteful number, since it uses less digits than its factorization.

7611968721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6143708.

The product of its digits is 254016, while the sum is 48.

The square root of 7611968721 is about 87246.5971886583. The cubic root of 7611968721 is about 1967.1266933275.

The spelling of 7611968721 in words is "seven billion, six hundred eleven million, nine hundred sixty-eight thousand, seven hundred twenty-one".