11661555151010 has 24 divisors (see below), whose sum is σ = 21246747595740. Its totient is φ = 4608421767392.

The previous prime is 11661555151009. The next prime is 11661555151013. The reversal of 11661555151010 is 1015155516611.

It can be written as a sum of positive squares in 2 ways, for example, as 10623212492929 + 1038342658081 = 3259327^2 + 1018991^2 .

It is not an unprimeable number, because it can be changed into a prime (11661555151013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84570065 + ... + 84707844.

Almost surely, 2^{11661555151010} is an apocalyptic number.

11661555151010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11661555151010 is a deficient number, since it is larger than the sum of its proper divisors (9585192444730).

11661555151010 is an equidigital number, since it uses as much as digits as its factorization.

11661555151010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169278082 (or 169277999 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 38.

The spelling of 11661555151010 in words is "eleven trillion, six hundred sixty-one billion, five hundred fifty-five million, one hundred fifty-one thousand, ten".