16430969781 has 24 divisors (see below), whose sum is σ = 23863091616. Its totient is φ = 10894356000.

The previous prime is 16430969771. The next prime is 16430969851. The reversal of 16430969781 is 18796903461.

It is not a de Polignac number, because 16430969781 - 2⁵ = 16430969749 is a prime.

It is a super-2 number, since 2×16430969781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16430969771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1650886 + ... + 1660808.

It is an arithmetic number, because the mean of its divisors is an integer number (994295484).

Almost surely, 2^16430969781 is an apocalyptic number.

It is an amenable number.

16430969781 is a deficient number, since it is larger than the sum of its proper divisors (7432121835).

16430969781 is a wasteful number, since it uses less digits than its factorization.

16430969781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10913 (or 10910 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 16430969781 in words is "sixteen billion, four hundred thirty million, nine hundred sixty-nine thousand, seven hundred eighty-one".