1861871355064 has 64 divisors (see below), whose sum is σ = 4017070376640. Its totient is φ = 792485514240.

The previous prime is 1861871355041. The next prime is 1861871355067. The reversal of 1861871355064 is 4605531781681.

It is a junction number, because it is equal to n+sod(n) for n = 1861871354996 and 1861871355014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861871355067) 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, 9014292 + ... + 9218524.

It is an arithmetic number, because the mean of its divisors is an integer number (62766724635).

Almost surely, 2^{1861871355064} is an apocalyptic number.

1861871355064 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1861871355064 is an abundant number, since it is smaller than the sum of its proper divisors (2155199021576).

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

1861871355064 is a wasteful number, since it uses less digits than its factorization.

1861871355064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205360 (or 205356 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 1861871355064 in words is "one trillion, eight hundred sixty-one billion, eight hundred seventy-one million, three hundred fifty-five thousand, sixty-four".