61211539684 has 6 divisors (see below), whose sum is σ = 107120194454. Its totient is φ = 30605769840.

The previous prime is 61211539673. The next prime is 61211539759. The reversal of 61211539684 is 48693511216.

It can be written as a sum of positive squares in only one way, i.e., 35637133284 + 25574406400 = 188778^2 + 159920^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7651442457 + ... + 7651442464.

Almost surely, 2^61211539684 is an apocalyptic number.

It is an amenable number.

61211539684 is a deficient number, since it is larger than the sum of its proper divisors (45908654770).

61211539684 is a wasteful number, since it uses less digits than its factorization.

61211539684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15302884925 (or 15302884923 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The spelling of 61211539684 in words is "sixty-one billion, two hundred eleven million, five hundred thirty-nine thousand, six hundred eighty-four".