16137725991 has 4 divisors (see below), whose sum is σ = 21516967992. Its totient is φ = 10758483992.

The previous prime is 16137725963. The next prime is 16137725999. The reversal of 16137725991 is 19952773161.

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

It is a cyclic number.

It is not a de Polignac number, because 16137725991 - 2³³ = 7547791399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16137725999) 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, 2689620996 + ... + 2689621001.

It is an arithmetic number, because the mean of its divisors is an integer number (5379241998).

Almost surely, 2^16137725991 is an apocalyptic number.

16137725991 is a deficient number, since it is larger than the sum of its proper divisors (5379242001).

16137725991 is an equidigital number, since it uses as much as digits as its factorization.

16137725991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5379242000.

The product of its digits is 714420, while the sum is 51.

The spelling of 16137725991 in words is "sixteen billion, one hundred thirty-seven million, seven hundred twenty-five thousand, nine hundred ninety-one".