61211539685 has 16 divisors (see below), whose sum is σ = 78289742592. Its totient is φ = 45783456000.

The previous prime is 61211539673. The next prime is 61211539759. The reversal of 61211539685 is 58693511216.

It is not a de Polignac number, because 61211539685 - 2²⁴ = 61194762469 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2371721 + ... + 2397390.

It is an arithmetic number, because the mean of its divisors is an integer number (4893108912).

Almost surely, 2^61211539685 is an apocalyptic number.

It is an amenable number.

61211539685 is a deficient number, since it is larger than the sum of its proper divisors (17078202907).

61211539685 is a wasteful number, since it uses less digits than its factorization.

61211539685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4769284.

The product of its digits is 388800, while the sum is 47.

The spelling of 61211539685 in words is "sixty-one billion, two hundred eleven million, five hundred thirty-nine thousand, six hundred eighty-five".