61051550181 has 4 divisors (see below), whose sum is σ = 81402066912. Its totient is φ = 40701033452.

The previous prime is 61051550149. The next prime is 61051550213. The reversal of 61051550181 is 18105515016.

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.

It is an interprime number because it is at equal distance from previous prime (61051550149) and next prime (61051550213).

It is a cyclic number.

It is not a de Polignac number, because 61051550181 - 2⁵ = 61051550149 is a prime.

It is a super-2 number, since 2×61051550181² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61051550141) 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, 10175258361 + ... + 10175258366.

It is an arithmetic number, because the mean of its divisors is an integer number (20350516728).

Almost surely, 2^61051550181 is an apocalyptic number.

It is an amenable number.

61051550181 is a deficient number, since it is larger than the sum of its proper divisors (20350516731).

61051550181 is a wasteful number, since it uses less digits than its factorization.

61051550181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20350516730.

The product of its (nonzero) digits is 6000, while the sum is 33.

The spelling of 61051550181 in words is "sixty-one billion, fifty-one million, five hundred fifty thousand, one hundred eighty-one".