1661450110538 has 32 divisors (see below), whose sum is σ = 2624344330320. Its totient is φ = 787735872000.

The previous prime is 1661450110511. The next prime is 1661450110543. The reversal of 1661450110538 is 8350110541661.

It can be written as a sum of positive squares in 8 ways, for example, as 146155583809 + 1515294526729 = 382303^2 + 1230973^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1661450110495 and 1661450110504.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 1983398 + ... + 2693838.

Almost surely, 2^{1661450110538} is an apocalyptic number.

1661450110538 is a deficient number, since it is larger than the sum of its proper divisors (962894219782).

1661450110538 is a wasteful number, since it uses less digits than its factorization.

1661450110538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711194.

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 1661450110538 in words is "one trillion, six hundred sixty-one billion, four hundred fifty million, one hundred ten thousand, five hundred thirty-eight".