206969972375401 has 9 divisors (see below), whose sum is σ = 212715485813271. Its totient is φ = 201375671425992.

The previous prime is 206969972375399. The next prime is 206969972375503. The reversal of 206969972375401 is 104573279969602.

The square root of 206969972375401 is 14386451.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 185199573528025 + 21770398847376 = 13608805^2 + 4665876^2 .

It is not a de Polignac number, because 206969972375401 - 2¹ = 206969972375399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206969972355401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 532104276 + ... + 532493098.

Almost surely, 2^{206969972375401} is an apocalyptic number.

206969972375401 is the 14386451-st square number.

206969972375401 is the 7193226-th centered octagonal number.

It is an amenable number.

206969972375401 is a deficient number, since it is larger than the sum of its proper divisors (5745513437870).

206969972375401 is an frugal number, since it uses more digits than its factorization.

206969972375401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777720 (or 388860 counting only the distinct ones).

The product of its (nonzero) digits is 308629440, while the sum is 70.

The spelling of 206969972375401 in words is "two hundred six trillion, nine hundred sixty-nine billion, nine hundred seventy-two million, three hundred seventy-five thousand, four hundred one".