1665165656151 has 24 divisors (see below), whose sum is σ = 2427423570000. Its totient is φ = 1099872525312.

The previous prime is 1665165656117. The next prime is 1665165656207. The reversal of 1665165656151 is 1516565615661.

1665165656151 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 16 + 5 + 6 + 5 + 615 + 1 = 666.

It is not a de Polignac number, because 1665165656151 - 2²¹ = 1665163558999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665165656251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39345400 + ... + 39387698.

It is an arithmetic number, because the mean of its divisors is an integer number (101142648750).

Almost surely, 2^{1665165656151} is an apocalyptic number.

1665165656151 is a deficient number, since it is larger than the sum of its proper divisors (762257913849).

1665165656151 is a wasteful number, since it uses less digits than its factorization.

1665165656151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82543 (or 82540 counting only the distinct ones).

The product of its digits is 4860000, while the sum is 54.

The spelling of 1665165656151 in words is "one trillion, six hundred sixty-five billion, one hundred sixty-five million, six hundred fifty-six thousand, one hundred fifty-one".