61145531771 has 8 divisors (see below), whose sum is σ = 61222034160. Its totient is φ = 61069069152.

The previous prime is 61145531761. The next prime is 61145531801. The reversal of 61145531771 is 17713554116.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61145531771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61145531731) 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, 4046396 + ... + 4061478.

It is an arithmetic number, because the mean of its divisors is an integer number (7652754270).

Almost surely, 2^61145531771 is an apocalyptic number.

61145531771 is a deficient number, since it is larger than the sum of its proper divisors (76502389).

61145531771 is a wasteful number, since it uses less digits than its factorization.

61145531771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19885.

The product of its digits is 88200, while the sum is 41.

The spelling of 61145531771 in words is "sixty-one billion, one hundred forty-five million, five hundred thirty-one thousand, seven hundred seventy-one".