641747166 has 16 divisors (see below), whose sum is σ = 1318183824. Its totient is φ = 208134144.

The previous prime is 641747149. The next prime is 641747191. The reversal of 641747166 is 661747146.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1445155 + ... + 1445598.

It is an arithmetic number, because the mean of its divisors is an integer number (82386489).

Almost surely, 2^641747166 is an apocalyptic number.

641747166 is an abundant number, since it is smaller than the sum of its proper divisors (676436658).

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

641747166 is a wasteful number, since it uses less digits than its factorization.

641747166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890795.

The product of its digits is 169344, while the sum is 42.

The square root of 641747166 is about 25332.7291463040. The cubic root of 641747166 is about 862.5573624525.

The spelling of 641747166 in words is "six hundred forty-one million, seven hundred forty-seven thousand, one hundred sixty-six".