686913191380 has 24 divisors (see below), whose sum is σ = 1553480602632. Its totient is φ = 253629485952.

The previous prime is 686913191369. The next prime is 686913191387. The reversal of 686913191380 is 83191319686.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2474664516 + 684438526864 = 49746^2 + 827308^2 .

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686913191387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1320986647 + ... + 1320987166.

It is an arithmetic number, because the mean of its divisors is an integer number (64728358443).

Almost surely, 2^686913191380 is an apocalyptic number.

It is an amenable number.

686913191380 is an abundant number, since it is smaller than the sum of its proper divisors (866567411252).

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

686913191380 is a wasteful number, since it uses less digits than its factorization.

686913191380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2641973835 (or 2641973833 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 686913191380 in words is "six hundred eighty-six billion, nine hundred thirteen million, one hundred ninety-one thousand, three hundred eighty".