19150399997689 has 3 divisors (see below), whose sum is σ = 19150404373807. Its totient is φ = 19150395621572.

The previous prime is 19150399997657. The next prime is 19150399997723. The reversal of 19150399997689 is 98679999305191.

It is a happy number.

The square root of 19150399997689 is 4376117.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 14693690565225 + 4456709432464 = 3833235^2 + 2111092^2 .

It is not a de Polignac number, because 19150399997689 - 2⁵ = 19150399997657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19150399991689) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2188059 + ... + 6564175.

Almost surely, 2^{19150399997689} is an apocalyptic number.

19150399997689 is the 4376117-th square number.

19150399997689 is the 2188059-th centered octagonal number.

It is an amenable number.

19150399997689 is a deficient number, since it is larger than the sum of its proper divisors (4376118).

19150399997689 is an frugal number, since it uses more digits than its factorization.

19150399997689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8752234 (or 4376117 counting only the distinct ones).

The product of its (nonzero) digits is 2678462640, while the sum is 85.

The spelling of 19150399997689 in words is "nineteen trillion, one hundred fifty billion, three hundred ninety-nine million, nine hundred ninety-seven thousand, six hundred eighty-nine".