211477897806 has 64 divisors (see below), whose sum is σ = 508966993920. Its totient is φ = 57225489120.

The previous prime is 211477897793. The next prime is 211477897823. The reversal of 211477897806 is 608798774112.

It is a super-2 number, since 2×211477897806² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 211477897806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2841651 + ... + 2915121.

It is an arithmetic number, because the mean of its divisors is an integer number (7952609280).

Almost surely, 2^211477897806 is an apocalyptic number.

211477897806 is an abundant number, since it is smaller than the sum of its proper divisors (297489096114).

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

211477897806 is a wasteful number, since it uses less digits than its factorization.

211477897806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77109.

The product of its (nonzero) digits is 9483264, while the sum is 60.

The spelling of 211477897806 in words is "two hundred eleven billion, four hundred seventy-seven million, eight hundred ninety-seven thousand, eight hundred six".