165777190497 has 48 divisors (see below), whose sum is σ = 259764890112. Its totient is φ = 101494149120.

The previous prime is 165777190493. The next prime is 165777190499. The reversal of 165777190497 is 794091777561.

165777190497 is a `hidden beast` number, since 1 + 6 + 5 + 77 + 71 + 9 + 0 + 497 = 666.

It is not a de Polignac number, because 165777190497 - 2² = 165777190493 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (165777190493) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 975048 + ... + 1132374.

It is an arithmetic number, because the mean of its divisors is an integer number (5411768544).

Almost surely, 2^165777190497 is an apocalyptic number.

165777190497 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

165777190497 is a deficient number, since it is larger than the sum of its proper divisors (93987699615).

165777190497 is a wasteful number, since it uses less digits than its factorization.

165777190497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157518 (or 157515 counting only the distinct ones).

The product of its (nonzero) digits is 23337720, while the sum is 63.

The spelling of 165777190497 in words is "one hundred sixty-five billion, seven hundred seventy-seven million, one hundred ninety thousand, four hundred ninety-seven".