16261699987 has 4 divisors (see below), whose sum is σ = 17512600000. Its totient is φ = 15010799976.

The previous prime is 16261699981. The next prime is 16261699997. The reversal of 16261699987 is 78999616261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16261699987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16261699981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 625449987 + ... + 625450012.

It is an arithmetic number, because the mean of its divisors is an integer number (4378150000).

Almost surely, 2^16261699987 is an apocalyptic number.

16261699987 is a deficient number, since it is larger than the sum of its proper divisors (1250900013).

16261699987 is a wasteful number, since it uses less digits than its factorization.

16261699987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250900012.

The product of its digits is 17635968, while the sum is 64.

The spelling of 16261699987 in words is "sixteen billion, two hundred sixty-one million, six hundred ninety-nine thousand, nine hundred eighty-seven".