671247452778 has 128 divisors (see below), whose sum is σ = 1618138890240. Its totient is φ = 181611279360.

The previous prime is 671247452753. The next prime is 671247452819. The reversal of 671247452778 is 877254742176.

It is a happy number.

671247452778 is digitally balanced in base 2, because in such base 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, 12043038 + ... + 12098646.

It is an arithmetic number, because the mean of its divisors is an integer number (12641710080).

Almost surely, 2^671247452778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671247452778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (809069445120).

671247452778 is an abundant number, since it is smaller than the sum of its proper divisors (946891437462).

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

671247452778 is a wasteful number, since it uses less digits than its factorization.

671247452778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55852.

The product of its digits is 36879360, while the sum is 60.

The spelling of 671247452778 in words is "six hundred seventy-one billion, two hundred forty-seven million, four hundred fifty-two thousand, seven hundred seventy-eight".