61685921400 has 96 divisors (see below), whose sum is σ = 192622425840. Its totient is φ = 16329487360.

The previous prime is 61685921383. The next prime is 61685921441. The reversal of 61685921400 is 412958616.

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 23 ways as a sum of consecutive naturals, for example, 293019 + ... + 457418.

Almost surely, 2^61685921400 is an apocalyptic number.

61685921400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61685921400 is an abundant number, since it is smaller than the sum of its proper divisors (130936504440).

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

61685921400 is a wasteful number, since it uses less digits than its factorization.

61685921400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750593 (or 750584 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 61685921400 in words is "sixty-one billion, six hundred eighty-five million, nine hundred twenty-one thousand, four hundred".