61087420181 has 4 divisors (see below), whose sum is σ = 61088001600. Its totient is φ = 61086838764.

The previous prime is 61087420153. The next prime is 61087420189. The reversal of 61087420181 is 18102478016.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61087420181 - 2⁶ = 61087420117 is a prime.

It is a super-2 number, since 2×61087420181² (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 (61087420189) 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, 84221 + ... + 359538.

It is an arithmetic number, because the mean of its divisors is an integer number (15272000400).

Almost surely, 2^61087420181 is an apocalyptic number.

It is an amenable number.

61087420181 is a deficient number, since it is larger than the sum of its proper divisors (581419).

61087420181 is a wasteful number, since it uses less digits than its factorization.

61087420181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581418.

The product of its (nonzero) digits is 21504, while the sum is 38.

Adding to 61087420181 its reverse (18102478016), we get a palindrome (79189898197).

The spelling of 61087420181 in words is "sixty-one billion, eighty-seven million, four hundred twenty thousand, one hundred eighty-one".