61686570140 has 48 divisors (see below), whose sum is σ = 141272503680. Its totient is φ = 22488261120.

The previous prime is 61686570139. The next prime is 61686570149. The reversal of 61686570140 is 4107568616.

It is a junction number, because it is equal to n+sod(n) for n = 61686570091 and 61686570100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61686570149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1481081 + ... + 1522160.

It is an arithmetic number, because the mean of its divisors is an integer number (2943177160).

Almost surely, 2^61686570140 is an apocalyptic number.

It is an amenable number.

61686570140 is an abundant number, since it is smaller than the sum of its proper divisors (79585933540).

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

61686570140 is a wasteful number, since it uses less digits than its factorization.

61686570140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003342 (or 3003340 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 61686570140 in words is "sixty-one billion, six hundred eighty-six million, five hundred seventy thousand, one hundred forty".