19270400661 has 20 divisors (see below), whose sum is σ = 30038244192. Its totient is φ = 12288370248.

The previous prime is 19270400659. The next prime is 19270400687. The reversal of 19270400661 is 16600407291.

19270400661 is a `hidden beast` number, since 192 + 7 + 0 + 400 + 6 + 61 = 666.

It is not a de Polignac number, because 19270400661 - 2¹ = 19270400659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19270400641) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5170011 + ... + 5173736.

Almost surely, 2^19270400661 is an apocalyptic number.

It is an amenable number.

19270400661 is a deficient number, since it is larger than the sum of its proper divisors (10767843531).

19270400661 is a wasteful number, since it uses less digits than its factorization.

19270400661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10343782 (or 10343773 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 19270400661 in words is "nineteen billion, two hundred seventy million, four hundred thousand, six hundred sixty-one".