61770565500663 has 4 divisors (see below), whose sum is σ = 82360754000888. Its totient is φ = 41180377000440.

The previous prime is 61770565500629. The next prime is 61770565500691. The reversal of 61770565500663 is 36600556507716.

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

It is not a de Polignac number, because 61770565500663 - 2⁸ = 61770565500407 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 (61770565500613) 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, 10295094250108 + ... + 10295094250113.

It is an arithmetic number, because the mean of its divisors is an integer number (20590188500222).

Almost surely, 2^{61770565500663} is an apocalyptic number.

61770565500663 is a deficient number, since it is larger than the sum of its proper divisors (20590188500225).

61770565500663 is a wasteful number, since it uses less digits than its factorization.

61770565500663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20590188500224.

The product of its (nonzero) digits is 23814000, while the sum is 57.

The spelling of 61770565500663 in words is "sixty-one trillion, seven hundred seventy billion, five hundred sixty-five million, five hundred thousand, six hundred sixty-three".