165697029481 has 3 divisors (see below), whose sum is σ = 165697436541. Its totient is φ = 165696622422.

The previous prime is 165697029473. The next prime is 165697029497. The reversal of 165697029481 is 184920796561.

The square root of 165697029481 is 407059.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 184920796561 = 1487 ⋅124358303.

It is not a de Polignac number, because 165697029481 - 2³ = 165697029473 is a prime.

It is a super-2 number, since 2×165697029481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165697021481) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 203530 + ... + 610588.

It is an arithmetic number, because the mean of its divisors is an integer number (55232478847).

Almost surely, 2^165697029481 is an apocalyptic number.

165697029481 is the 407059-th square number.

165697029481 is the 203530-th centered octagonal number.

It is an amenable number.

165697029481 is a deficient number, since it is larger than the sum of its proper divisors (407060).

165697029481 is an frugal number, since it uses more digits than its factorization.

165697029481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814118 (or 407059 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 58.

The spelling of 165697029481 in words is "one hundred sixty-five billion, six hundred ninety-seven million, twenty-nine thousand, four hundred eighty-one".