61497986844 has 72 divisors (see below), whose sum is σ = 172679124240. Its totient is φ = 16964957184.

The previous prime is 61497986839. The next prime is 61497986857. The reversal of 61497986844 is 44868979416.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1786197 + ... + 1820300.

It is an arithmetic number, because the mean of its divisors is an integer number (2398321170).

Almost surely, 2^61497986844 is an apocalyptic number.

It is an amenable number.

61497986844 is an abundant number, since it is smaller than the sum of its proper divisors (111181137396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61497986844 is a wasteful number, since it uses less digits than its factorization.

61497986844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3606547 (or 3606538 counting only the distinct ones).

The product of its digits is 83607552, while the sum is 66.

The spelling of 61497986844 in words is "sixty-one billion, four hundred ninety-seven million, nine hundred eighty-six thousand, eight hundred forty-four".