16400035856 has 10 divisors (see below), whose sum is σ = 31775069502. Its totient is φ = 8200017920.

The previous prime is 16400035853. The next prime is 16400035879. The reversal of 16400035856 is 65853000461.

It can be written as a sum of positive squares in only one way, i.e., 16252170256 + 147865600 = 127484^2 + 12160^2 .

It is a super-2 number, since 2×16400035856² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16400035853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512501105 + ... + 512501136.

Almost surely, 2^16400035856 is an apocalyptic number.

16400035856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16400035856 is a deficient number, since it is larger than the sum of its proper divisors (15375033646).

16400035856 is a wasteful number, since it uses less digits than its factorization.

16400035856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025002249 (or 1025002243 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 16400035856 in words is "sixteen billion, four hundred million, thirty-five thousand, eight hundred fifty-six".