61684220485 has 8 divisors (see below), whose sum is σ = 74202047640. Its totient is φ = 49226721024.

The previous prime is 61684220473. The next prime is 61684220509. The reversal of 61684220485 is 58402248616.

It can be written as a sum of positive squares in 4 ways, for example, as 40901826564 + 20782393921 = 202242^2 + 144161^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61684220485 - 2⁹ = 61684219973 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15079672 + ... + 15083761.

It is an arithmetic number, because the mean of its divisors is an integer number (9275255955).

Almost surely, 2^61684220485 is an apocalyptic number.

It is an amenable number.

61684220485 is a deficient number, since it is larger than the sum of its proper divisors (12517827155).

61684220485 is a wasteful number, since it uses less digits than its factorization.

61684220485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30163847.

The product of its (nonzero) digits is 737280, while the sum is 46.

The spelling of 61684220485 in words is "sixty-one billion, six hundred eighty-four million, two hundred twenty thousand, four hundred eighty-five".