16551431550061 has 16 divisors (see below), whose sum is σ = 17534738828800. Its totient is φ = 15579400295088.

The previous prime is 16551431550019. The next prime is 16551431550103. The reversal of 16551431550061 is 16005513415561.

It is an interprime number because it is at equal distance from previous prime (16551431550019) and next prime (16551431550103).

It is a cyclic number.

It is not a de Polignac number, because 16551431550061 - 2³⁵ = 16517071811693 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 (16551431550361) 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, 9473830 + ... + 11084056.

It is an arithmetic number, because the mean of its divisors is an integer number (1095921176800).

Almost surely, 2^{16551431550061} is an apocalyptic number.

It is an amenable number.

16551431550061 is a deficient number, since it is larger than the sum of its proper divisors (983307278739).

16551431550061 is a wasteful number, since it uses less digits than its factorization.

16551431550061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613728.

The product of its (nonzero) digits is 270000, while the sum is 43.

The spelling of 16551431550061 in words is "sixteen trillion, five hundred fifty-one billion, four hundred thirty-one million, five hundred fifty thousand, sixty-one".