16556510001551 has 32 divisors (see below), whose sum is σ = 19300352440320. Its totient is φ = 14081377939200.

The previous prime is 16556510001511. The next prime is 16556510001571. The reversal of 16556510001551 is 15510001565561.

It is not a de Polignac number, because 16556510001551 - 2¹⁴ = 16556509985167 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16556510001499 and 16556510001508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16556510001511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7579385 + ... + 9516306.

It is an arithmetic number, because the mean of its divisors is an integer number (603136013760).

Almost surely, 2^{16556510001551} is an apocalyptic number.

16556510001551 is a deficient number, since it is larger than the sum of its proper divisors (2743842438769).

16556510001551 is a wasteful number, since it uses less digits than its factorization.

16556510001551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17095847.

The product of its (nonzero) digits is 112500, while the sum is 41.

The spelling of 16556510001551 in words is "sixteen trillion, five hundred fifty-six billion, five hundred ten million, one thousand, five hundred fifty-one".