16900779881 has 2 divisors, whose sum is σ = 16900779882. Its totient is φ = 16900779880.

The previous prime is 16900779859. The next prime is 16900779911. The reversal of 16900779881 is 18897700961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16619077225 + 281702656 = 128915^2 + 16784^2 .

It is an emirp because it is prime and its reverse (18897700961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16900779881 - 2²² = 16896585577 is a prime.

It is a super-2 number, since 2×16900779881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16900779811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8450389940 + 8450389941.

It is an arithmetic number, because the mean of its divisors is an integer number (8450389941).

Almost surely, 2^16900779881 is an apocalyptic number.

It is an amenable number.

16900779881 is a deficient number, since it is larger than the sum of its proper divisors (1).

16900779881 is an equidigital number, since it uses as much as digits as its factorization.

16900779881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 56.

The spelling of 16900779881 in words is "sixteen billion, nine hundred million, seven hundred seventy-nine thousand, eight hundred eighty-one".