61897961808 has 100 divisors (see below), whose sum is σ = 181309416288. Its totient is φ = 20384032320.

The previous prime is 61897961777. The next prime is 61897961837. The reversal of 61897961808 is 80816979816.

61897961808 is a `hidden beast` number, since 6 + 1 + 8 + 9 + 7 + 9 + 618 + 0 + 8 = 666.

It is a congruent number.

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 in 19 ways as a sum of consecutive naturals, for example, 180148 + ... + 395283.

Almost surely, 2^61897961808 is an apocalyptic number.

It is an amenable number.

61897961808 is an abundant number, since it is smaller than the sum of its proper divisors (119411454480).

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

61897961808 is a wasteful number, since it uses less digits than its factorization.

61897961808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575534 (or 575519 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The spelling of 61897961808 in words is "sixty-one billion, eight hundred ninety-seven million, nine hundred sixty-one thousand, eight hundred eight".