61985317711 has 4 divisors (see below), whose sum is σ = 61987474800. Its totient is φ = 61983160624.

The previous prime is 61985317579. The next prime is 61985317777. The reversal of 61985317711 is 11771358916.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61985317711 - 2¹⁷ = 61985186639 is a prime.

It is a super-2 number, since 2×61985317711² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61985017711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1034851 + ... + 1093108.

It is an arithmetic number, because the mean of its divisors is an integer number (15496868700).

Almost surely, 2^61985317711 is an apocalyptic number.

61985317711 is a deficient number, since it is larger than the sum of its proper divisors (2157089).

61985317711 is a wasteful number, since it uses less digits than its factorization.

61985317711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157088.

The product of its digits is 317520, while the sum is 49.

The spelling of 61985317711 in words is "sixty-one billion, nine hundred eighty-five million, three hundred seventeen thousand, seven hundred eleven".