211172749064 has 16 divisors (see below), whose sum is σ = 396180614700. Its totient is φ = 105524585152.

The previous prime is 211172749063. The next prime is 211172749091. The reversal of 211172749064 is 460947271112.

It can be written as a sum of positive squares in 2 ways, for example, as 154928832100 + 56243916964 = 393610^2 + 237158^2 .

It is a super-2 number, since 2×211172749064² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211172749063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7709147 + ... + 7736490.

Almost surely, 2^211172749064 is an apocalyptic number.

It is an amenable number.

211172749064 is a deficient number, since it is larger than the sum of its proper divisors (185007865636).

211172749064 is a wasteful number, since it uses less digits than its factorization.

211172749064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15447352 (or 15447348 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 211172749064 in words is "two hundred eleven billion, one hundred seventy-two million, seven hundred forty-nine thousand, sixty-four".