61661588443 has 8 divisors (see below), whose sum is σ = 75891185888. Its totient is φ = 48787190784.

The previous prime is 61661588431. The next prime is 61661588489. The reversal of 61661588443 is 34488516616.

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 61661588443 - 2⁵ = 61661588411 is a prime.

It is a super-2 number, since 2×61661588443² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61661588413) 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, 338799846 + ... + 338800027.

It is an arithmetic number, because the mean of its divisors is an integer number (9486398236).

Almost surely, 2^61661588443 is an apocalyptic number.

61661588443 is a deficient number, since it is larger than the sum of its proper divisors (14229597445).

61661588443 is a wasteful number, since it uses less digits than its factorization.

61661588443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677599893.

The product of its digits is 3317760, while the sum is 52.

The spelling of 61661588443 in words is "sixty-one billion, six hundred sixty-one million, five hundred eighty-eight thousand, four hundred forty-three".