61156511011 has 4 divisors (see below), whose sum is σ = 61168302000. Its totient is φ = 61144720024.

The previous prime is 61156510993. The next prime is 61156511023. The reversal of 61156511011 is 11011565116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61156511011 - 2¹⁷ = 61156379939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61156511071) 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, 5887711 + ... + 5898088.

It is an arithmetic number, because the mean of its divisors is an integer number (15292075500).

Almost surely, 2^61156511011 is an apocalyptic number.

61156511011 is a deficient number, since it is larger than the sum of its proper divisors (11790989).

61156511011 is a wasteful number, since it uses less digits than its factorization.

61156511011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11790988.

The product of its (nonzero) digits is 900, while the sum is 28.

The spelling of 61156511011 in words is "sixty-one billion, one hundred fifty-six million, five hundred eleven thousand, eleven".