191400852564 has 18 divisors (see below), whose sum is σ = 483818821850. Its totient is φ = 63800284176.

The previous prime is 191400852541. The next prime is 191400852607. The reversal of 191400852564 is 465258004191.

191400852564 is a `hidden beast` number, since 1 + 9 + 1 + 4 + 0 + 0 + 85 + 2 + 564 = 666.

It can be written as a sum of positive squares in only one way, i.e., 189486090000 + 1914762564 = 435300^2 + 43758^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2658345139 + ... + 2658345210.

Almost surely, 2^191400852564 is an apocalyptic number.

It is an amenable number.

191400852564 is an abundant number, since it is smaller than the sum of its proper divisors (292417969286).

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

191400852564 is a wasteful number, since it uses less digits than its factorization.

191400852564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5316690359 (or 5316690354 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 191400852564 in words is "one hundred ninety-one billion, four hundred million, eight hundred fifty-two thousand, five hundred sixty-four".