61663776481 has 8 divisors (see below), whose sum is σ = 62684370144. Its totient is φ = 60651514560.

The previous prime is 61663776479. The next prime is 61663776497. The reversal of 61663776481 is 18467736616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61663776481 - 2¹ = 61663776479 is a prime.

It is a super-2 number, since 2×61663776481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61663777481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2068011 + ... + 2097616.

It is an arithmetic number, because the mean of its divisors is an integer number (7835546268).

Almost surely, 2^61663776481 is an apocalyptic number.

It is an amenable number.

61663776481 is a deficient number, since it is larger than the sum of its proper divisors (1020593663).

61663776481 is a wasteful number, since it uses less digits than its factorization.

61663776481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165871.

The product of its digits is 6096384, while the sum is 55.

The spelling of 61663776481 in words is "sixty-one billion, six hundred sixty-three million, seven hundred seventy-six thousand, four hundred eighty-one".