16781640546 has 32 divisors (see below), whose sum is σ = 37507530816. Its totient is φ = 4961312000.

The previous prime is 16781640539. The next prime is 16781640563. The reversal of 16781640546 is 64504618761.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 16781640495 and 16781640504.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3098115 + ... + 3103526.

It is an arithmetic number, because the mean of its divisors is an integer number (1172110338).

Almost surely, 2^16781640546 is an apocalyptic number.

16781640546 is an abundant number, since it is smaller than the sum of its proper divisors (20725890270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16781640546 is a wasteful number, since it uses less digits than its factorization.

16781640546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6201698.

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 16781640546 in words is "sixteen billion, seven hundred eighty-one million, six hundred forty thousand, five hundred forty-six".