61809169159 has 8 divisors (see below), whose sum is σ = 62183887920. Its totient is φ = 61434777600.

The previous prime is 61809169157. The next prime is 61809169187. The reversal of 61809169159 is 95196190816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61809169159 - 2¹ = 61809169157 is a prime.

It is a super-3 number, since 3×61809169159³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61809169157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302599 + ... + 463879.

It is an arithmetic number, because the mean of its divisors is an integer number (7772985990).

Almost surely, 2^61809169159 is an apocalyptic number.

61809169159 is a deficient number, since it is larger than the sum of its proper divisors (374718761).

61809169159 is a wasteful number, since it uses less digits than its factorization.

61809169159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163601.

The product of its (nonzero) digits is 1049760, while the sum is 55.

The spelling of 61809169159 in words is "sixty-one billion, eight hundred nine million, one hundred sixty-nine thousand, one hundred fifty-nine".