61105005501 has 4 divisors (see below), whose sum is σ = 81473340672. Its totient is φ = 40736670332.

The previous prime is 61105005497. The next prime is 61105005509. The reversal of 61105005501 is 10550050116.

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 a cyclic number.

It is not a de Polignac number, because 61105005501 - 2² = 61105005497 is a prime.

It is a super-2 number, since 2×61105005501² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61105005509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10184167581 + ... + 10184167586.

It is an arithmetic number, because the mean of its divisors is an integer number (20368335168).

Almost surely, 2^61105005501 is an apocalyptic number.

It is an amenable number.

61105005501 is a deficient number, since it is larger than the sum of its proper divisors (20368335171).

61105005501 is a wasteful number, since it uses less digits than its factorization.

61105005501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20368335170.

The product of its (nonzero) digits is 750, while the sum is 24.

Adding to 61105005501 its reverse (10550050116), we get a palindrome (71655055617).

The spelling of 61105005501 in words is "sixty-one billion, one hundred five million, five thousand, five hundred one".