1665100315945 has 16 divisors (see below), whose sum is σ = 2179812539520. Its totient is φ = 1210957129600.

The previous prime is 1665100315939. The next prime is 1665100315979. The reversal of 1665100315945 is 5495130015661.

It is not a de Polignac number, because 1665100315945 - 2¹⁷ = 1665100184873 is a prime.

It is a super-4 number, since 4×1665100315945⁴ (a number of 50 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1665100315895 and 1665100315904.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2637180 + ... + 3207010.

It is an arithmetic number, because the mean of its divisors is an integer number (136238283720).

Almost surely, 2^{1665100315945} is an apocalyptic number.

It is an amenable number.

1665100315945 is a deficient number, since it is larger than the sum of its proper divisors (514712223575).

1665100315945 is a wasteful number, since it uses less digits than its factorization.

1665100315945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622976.

The product of its (nonzero) digits is 486000, while the sum is 46.

It can be divided in two parts, 1665100 and 315945, that added together give a triangular number (1981045 = T₁₉₉₀).

The spelling of 1665100315945 in words is "one trillion, six hundred sixty-five billion, one hundred million, three hundred fifteen thousand, nine hundred forty-five".