16119431781 has 8 divisors (see below), whose sum is σ = 21494394240. Its totient is φ = 10745378592.

The previous prime is 16119431759. The next prime is 16119431789. The reversal of 16119431781 is 18713491161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16119431781 - 2⁵ = 16119431749 is a prime.

It is a super-2 number, since 2×16119431781² (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 (16119431789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184816 + ... + 257673.

It is an arithmetic number, because the mean of its divisors is an integer number (2686799280).

Almost surely, 2^16119431781 is an apocalyptic number.

It is an amenable number.

16119431781 is a deficient number, since it is larger than the sum of its proper divisors (5374962459).

16119431781 is a wasteful number, since it uses less digits than its factorization.

16119431781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454635.

The product of its digits is 36288, while the sum is 42.

The spelling of 16119431781 in words is "sixteen billion, one hundred nineteen million, four hundred thirty-one thousand, seven hundred eighty-one".