61020985311 has 96 divisors (see below), whose sum is σ = 110237091840. Its totient is φ = 33035558400.

The previous prime is 61020985309. The next prime is 61020985321. The reversal of 61020985311 is 11358902016.

61020985311 is a `hidden beast` number, since 6 + 10 + 20 + 98 + 531 + 1 = 666.

It is not a de Polignac number, because 61020985311 - 2¹ = 61020985309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61020985321) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1536375 + ... + 1575591.

It is an arithmetic number, because the mean of its divisors is an integer number (1148303040).

Almost surely, 2^61020985311 is an apocalyptic number.

61020985311 is a deficient number, since it is larger than the sum of its proper divisors (49216106529).

61020985311 is a wasteful number, since it uses less digits than its factorization.

61020985311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39294 (or 39275 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 61020985311 in words is "sixty-one billion, twenty million, nine hundred eighty-five thousand, three hundred eleven".