61548465181 has 4 divisors (see below), whose sum is σ = 70341103072. Its totient is φ = 52755827292.

The previous prime is 61548465149. The next prime is 61548465217. The reversal of 61548465181 is 18156484516.

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 not a de Polignac number, because 61548465181 - 2⁵ = 61548465149 is a prime.

It is a super-2 number, since 2×61548465181² (a number of 22 digits) contains 22 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 (61548465581) 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, 4396318935 + ... + 4396318948.

It is an arithmetic number, because the mean of its divisors is an integer number (17585275768).

Almost surely, 2^61548465181 is an apocalyptic number.

It is an amenable number.

61548465181 is a deficient number, since it is larger than the sum of its proper divisors (8792637891).

61548465181 is an equidigital number, since it uses as much as digits as its factorization.

61548465181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8792637890.

The product of its digits is 921600, while the sum is 49.

The spelling of 61548465181 in words is "sixty-one billion, five hundred forty-eight million, four hundred sixty-five thousand, one hundred eighty-one".