199945757687406 has 16 divisors (see below), whose sum is σ = 399894275728848. Its totient is φ = 66648125836800.

The previous prime is 199945757687359. The next prime is 199945757687527. The reversal of 199945757687406 is 604786757549991.

It is a super-2 number, since 2×199945757687406² (a number of 29 digits) contains 22 as substring.

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, 114072505 + ... + 115812036.

It is an arithmetic number, because the mean of its divisors is an integer number (24993392233053).

Almost surely, 2^{199945757687406} is an apocalyptic number.

199945757687406 is an abundant number, since it is smaller than the sum of its proper divisors (199948518041442).

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

199945757687406 is a wasteful number, since it uses less digits than its factorization.

199945757687406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230029507.

The product of its (nonzero) digits is 28805414400, while the sum is 87.

The spelling of 199945757687406 in words is "one hundred ninety-nine trillion, nine hundred forty-five billion, seven hundred fifty-seven million, six hundred eighty-seven thousand, four hundred six".