61090943985 has 80 divisors (see below), whose sum is σ = 112188628992. Its totient is φ = 31793731200.

The previous prime is 61090943981. The next prime is 61090944029. The reversal of 61090943985 is 58934909016.

It is not a de Polignac number, because 61090943985 - 2² = 61090943981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61090943981) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3127800 + ... + 3147270.

Almost surely, 2^61090943985 is an apocalyptic number.

It is an amenable number.

61090943985 is a deficient number, since it is larger than the sum of its proper divisors (51097685007).

61090943985 is a wasteful number, since it uses less digits than its factorization.

61090943985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19676 (or 19667 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 61090943985 in words is "sixty-one billion, ninety million, nine hundred forty-three thousand, nine hundred eighty-five".