7661605155 has 32 divisors (see below), whose sum is σ = 12351605760. Its totient is φ = 4055264640.

The previous prime is 7661605129. The next prime is 7661605183. The reversal of 7661605155 is 5515061667.

It is not a de Polignac number, because 7661605155 - 2¹⁶ = 7661539619 is a prime.

It is a super-2 number, since 2×7661605155² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1635106 + ... + 1639784.

It is an arithmetic number, because the mean of its divisors is an integer number (385987680).

Almost surely, 2^7661605155 is an apocalyptic number.

7661605155 is a deficient number, since it is larger than the sum of its proper divisors (4690000605).

7661605155 is a wasteful number, since it uses less digits than its factorization.

7661605155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5491.

The product of its (nonzero) digits is 189000, while the sum is 42.

The square root of 7661605155 is about 87530.5955366465. The cubic root of 7661605155 is about 1971.3932061161.

The spelling of 7661605155 in words is "seven billion, six hundred sixty-one million, six hundred five thousand, one hundred fifty-five".