61510656511 has 4 divisors (see below), whose sum is σ = 61574005224. Its totient is φ = 61447307800.

The previous prime is 61510656499. The next prime is 61510656527. The reversal of 61510656511 is 11565601516.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61510656511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61517656511) 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, 31672900 + ... + 31674841.

It is an arithmetic number, because the mean of its divisors is an integer number (15393501306).

Almost surely, 2^61510656511 is an apocalyptic number.

61510656511 is a deficient number, since it is larger than the sum of its proper divisors (63348713).

61510656511 is an equidigital number, since it uses as much as digits as its factorization.

61510656511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63348712.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 61510656511 in words is "sixty-one billion, five hundred ten million, six hundred fifty-six thousand, five hundred eleven".