16550256621 has 16 divisors (see below), whose sum is σ = 22668974784. Its totient is φ = 10732667904.

The previous prime is 16550256617. The next prime is 16550256631. The reversal of 16550256621 is 12665205561.

It is a happy number.

It is not a de Polignac number, because 16550256621 - 2² = 16550256617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16550256621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16550256631) 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, 502750 + ... + 534656.

It is an arithmetic number, because the mean of its divisors is an integer number (1416810924).

Almost surely, 2^16550256621 is an apocalyptic number.

It is an amenable number.

16550256621 is a deficient number, since it is larger than the sum of its proper divisors (6118718163).

16550256621 is a wasteful number, since it uses less digits than its factorization.

16550256621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36620.

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 16550256621 in words is "sixteen billion, five hundred fifty million, two hundred fifty-six thousand, six hundred twenty-one".