329541167561 has 4 divisors (see below), whose sum is σ = 332135980032. Its totient is φ = 326946355092.

The previous prime is 329541167551. The next prime is 329541167597. The reversal of 329541167561 is 165761145923.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165761145923 = 53 ⋅3127568791.

It is a cyclic number.

It is not a de Polignac number, because 329541167561 - 2⁶ = 329541167497 is a prime.

It is a super-2 number, since 2×329541167561² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (329541167521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1297406045 + ... + 1297406298.

It is an arithmetic number, because the mean of its divisors is an integer number (83033995008).

Almost surely, 2^329541167561 is an apocalyptic number.

It is an amenable number.

329541167561 is a deficient number, since it is larger than the sum of its proper divisors (2594812471).

329541167561 is a wasteful number, since it uses less digits than its factorization.

329541167561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594812470.

The product of its digits is 1360800, while the sum is 50.

The spelling of 329541167561 in words is "three hundred twenty-nine billion, five hundred forty-one million, one hundred sixty-seven thousand, five hundred sixty-one".