19855080137 has 4 divisors (see below), whose sum is σ = 20180573316. Its totient is φ = 19529586960.

The previous prime is 19855080101. The next prime is 19855080149. The reversal of 19855080137 is 73108055891.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1390618681 + 18464461456 = 37291^2 + 135884^2 .

It is a cyclic number.

It is not a de Polignac number, because 19855080137 - 2¹² = 19855076041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19855080091 and 19855080100.

It is not an unprimeable number, because it can be changed into a prime (19855080937) 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, 162746498 + ... + 162746619.

It is an arithmetic number, because the mean of its divisors is an integer number (5045143329).

Almost surely, 2^19855080137 is an apocalyptic number.

It is an amenable number.

19855080137 is a deficient number, since it is larger than the sum of its proper divisors (325493179).

19855080137 is an equidigital number, since it uses as much as digits as its factorization.

19855080137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325493178.

The product of its (nonzero) digits is 302400, while the sum is 47.

The spelling of 19855080137 in words is "nineteen billion, eight hundred fifty-five million, eighty thousand, one hundred thirty-seven".