16265387440 has 40 divisors (see below), whose sum is σ = 38191470768. Its totient is φ = 6441734400.

The previous prime is 16265387401. The next prime is 16265387461. The reversal of 16265387440 is 4478356261.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998442 + ... + 1014601.

Almost surely, 2^16265387440 is an apocalyptic number.

16265387440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16265387440 is an abundant number, since it is smaller than the sum of its proper divisors (21926083328).

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

16265387440 is a wasteful number, since it uses less digits than its factorization.

16265387440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013157 (or 2013151 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 16265387440 in words is "sixteen billion, two hundred sixty-five million, three hundred eighty-seven thousand, four hundred forty".