1645695920097 has 6 divisors (see below), whose sum is σ = 2377116329042. Its totient is φ = 1097130613392.

The previous prime is 1645695920083. The next prime is 1645695920129. The reversal of 1645695920097 is 7900295965461.

1645695920097 is a `hidden beast` number, since 1 + 6 + 456 + 9 + 5 + 92 + 0 + 0 + 97 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1200391949376 + 445303970721 = 1095624^2 + 667311^2 .

It is not a de Polignac number, because 1645695920097 - 2¹² = 1645695916001 is a prime.

It is a super-2 number, since 2×1645695920097² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645695921097) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91427551108 + ... + 91427551125.

Almost surely, 2^{1645695920097} is an apocalyptic number.

It is an amenable number.

1645695920097 is a deficient number, since it is larger than the sum of its proper divisors (731420408945).

1645695920097 is a wasteful number, since it uses less digits than its factorization.

1645695920097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182855102239 (or 182855102236 counting only the distinct ones).

The product of its (nonzero) digits is 36741600, while the sum is 63.

The spelling of 1645695920097 in words is "one trillion, six hundred forty-five billion, six hundred ninety-five million, nine hundred twenty thousand, ninety-seven".