1665102220025 has 12 divisors (see below), whose sum is σ = 2064848500092. Its totient is φ = 1332003229440.

The previous prime is 1665102219973. The next prime is 1665102220039. The reversal of 1665102220025 is 5200222015661.

It can be written as a sum of positive squares in 6 ways, for example, as 252743485696 + 1412358734329 = 502736^2 + 1188427^2 .

It is not a de Polignac number, because 1665102220025 - 2⁸ = 1665102219769 is a prime.

It is a super-2 number, since 2×1665102220025² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1665102219973 and 1665102220000.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1529324 + ... + 2380973.

It is an arithmetic number, because the mean of its divisors is an integer number (172070708341).

Almost surely, 2^{1665102220025} is an apocalyptic number.

It is an amenable number.

1665102220025 is a deficient number, since it is larger than the sum of its proper divisors (399746280067).

1665102220025 is a wasteful number, since it uses less digits than its factorization.

1665102220025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927340 (or 3927335 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 1665102220025 its reverse (5200222015661), we get a palindrome (6865324235686).

The spelling of 1665102220025 in words is "one trillion, six hundred sixty-five billion, one hundred two million, two hundred twenty thousand, twenty-five".