61005111001 has 4 divisors (see below), whose sum is σ = 61248159504. Its totient is φ = 60762062500.

The previous prime is 61005110987. The next prime is 61005111019. The reversal of 61005111001 is 10011150016.

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 a de Polignac number, because none of the positive numbers 2^k-61005111001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61005111701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121523875 + ... + 121524376.

It is an arithmetic number, because the mean of its divisors is an integer number (15312039876).

Almost surely, 2^61005111001 is an apocalyptic number.

It is an amenable number.

61005111001 is a deficient number, since it is larger than the sum of its proper divisors (243048503).

61005111001 is a wasteful number, since it uses less digits than its factorization.

61005111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243048502.

The product of its (nonzero) digits is 30, while the sum is 16.

Adding to 61005111001 its reverse (10011150016), we get a palindrome (71016261017).

The spelling of 61005111001 in words is "sixty-one billion, five million, one hundred eleven thousand, one".