61661133514 has 16 divisors (see below), whose sum is σ = 95399191368. Its totient is φ = 29868556032.

The previous prime is 61661133511. The next prime is 61661133553. The reversal of 61661133514 is 41533116616.

It can be written as a sum of positive squares in 4 ways, for example, as 60917644225 + 743489289 = 246815^2 + 27267^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (61661133511) 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 7 ways as a sum of consecutive naturals, for example, 1770867 + ... + 1805350.

Almost surely, 2^61661133514 is an apocalyptic number.

61661133514 is a deficient number, since it is larger than the sum of its proper divisors (33738057854).

61661133514 is a wasteful number, since it uses less digits than its factorization.

61661133514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576489.

The product of its digits is 38880, while the sum is 37.

The spelling of 61661133514 in words is "sixty-one billion, six hundred sixty-one million, one hundred thirty-three thousand, five hundred fourteen".