61685383680 has 160 divisors (see below), whose sum is σ = 219111868800. Its totient is φ = 16449417216.

The previous prime is 61685383657. The next prime is 61685383693. The reversal of 61685383680 is 8638358616.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377100 + ... + 515339.

It is an arithmetic number, because the mean of its divisors is an integer number (1369449180).

Almost surely, 2^61685383680 is an apocalyptic number.

61685383680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61685383680 is an abundant number, since it is smaller than the sum of its proper divisors (157426485120).

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

61685383680 is an equidigital number, since it uses as much as digits as its factorization.

61685383680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892471 (or 892449 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 61685383680 in words is "sixty-one billion, six hundred eighty-five million, three hundred eighty-three thousand, six hundred eighty".