16401743431261 has 16 divisors (see below), whose sum is σ = 17609614410240. Its totient is φ = 15221395687680.

The previous prime is 16401743431231. The next prime is 16401743431267. The reversal of 16401743431261 is 16213434710461.

It is a cyclic number.

It is not a de Polignac number, because 16401743431261 - 2²¹ = 16401741334109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16401743431267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7049905 + ... + 9083206.

It is an arithmetic number, because the mean of its divisors is an integer number (1100600900640).

Almost surely, 2^{16401743431261} is an apocalyptic number.

It is an amenable number.

16401743431261 is a deficient number, since it is larger than the sum of its proper divisors (1207870978979).

16401743431261 is a wasteful number, since it uses less digits than its factorization.

16401743431261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16133964.

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 16401743431261 in words is "sixteen trillion, four hundred one billion, seven hundred forty-three million, four hundred thirty-one thousand, two hundred sixty-one".