199951455686401 has 4 divisors (see below), whose sum is σ = 199952370131904. Its totient is φ = 199950541240900.

The previous prime is 199951455686371. The next prime is 199951455686407. The reversal of 199951455686401 is 104686554159991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 199951455686401 - 2⁵ = 199951455686369 is a prime.

It is a super-2 number, since 2×199951455686401² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199951455686407) 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, 456894685 + ... + 457332106.

It is an arithmetic number, because the mean of its divisors is an integer number (49988092532976).

Almost surely, 2^{199951455686401} is an apocalyptic number.

It is an amenable number.

199951455686401 is a deficient number, since it is larger than the sum of its proper divisors (914445503).

199951455686401 is an equidigital number, since it uses as much as digits as its factorization.

199951455686401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914445502.

The product of its (nonzero) digits is 419904000, while the sum is 73.

The spelling of 199951455686401 in words is "one hundred ninety-nine trillion, nine hundred fifty-one billion, four hundred fifty-five million, six hundred eighty-six thousand, four hundred one".