671525811660 has 192 divisors, whose sum is σ = 2145242050560. Its totient is φ = 155363070720.

The previous prime is 671525811623. The next prime is 671525811701. The reversal of 671525811660 is 66118525176.

671525811660 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6674811 + ... + 6774669.

It is an arithmetic number, because the mean of its divisors is an integer number (11173135680).

Almost surely, 2^671525811660 is an apocalyptic number.

671525811660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671525811660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1072621025280).

671525811660 is an abundant number, since it is smaller than the sum of its proper divisors (1473716238900).

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

671525811660 is a wasteful number, since it uses less digits than its factorization.

671525811660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100348 (or 100346 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 48.

The spelling of 671525811660 in words is "six hundred seventy-one billion, five hundred twenty-five million, eight hundred eleven thousand, six hundred sixty".