161700542605 has 32 divisors (see below), whose sum is σ = 227693055744. Its totient is φ = 107931833856.

The previous prime is 161700542567. The next prime is 161700542611. The reversal of 161700542605 is 506245007161.

It is a happy number.

It is not a de Polignac number, because 161700542605 - 2²¹ = 161698445453 is a prime.

It is a super-2 number, since 2×161700542605² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 257617 + ... + 624313.

It is an arithmetic number, because the mean of its divisors is an integer number (7115407992).

Almost surely, 2^161700542605 is an apocalyptic number.

It is an amenable number.

161700542605 is a deficient number, since it is larger than the sum of its proper divisors (65992513139).

161700542605 is a wasteful number, since it uses less digits than its factorization.

161700542605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367045.

The product of its (nonzero) digits is 50400, while the sum is 37.

Adding to 161700542605 its reverse (506245007161), we get a palindrome (667945549766).

The spelling of 161700542605 in words is "one hundred sixty-one billion, seven hundred million, five hundred forty-two thousand, six hundred five".