19651625493 has 16 divisors (see below), whose sum is σ = 27051687936. Its totient is φ = 12676457520.

The previous prime is 19651625491. The next prime is 19651625527. The reversal of 19651625493 is 39452615691.

It is not a de Polignac number, because 19651625493 - 2¹ = 19651625491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19651625491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 770796 + ... + 795882.

It is an arithmetic number, because the mean of its divisors is an integer number (1690730496).

Almost surely, 2^19651625493 is an apocalyptic number.

It is an amenable number.

19651625493 is a deficient number, since it is larger than the sum of its proper divisors (7400062443).

19651625493 is a wasteful number, since it uses less digits than its factorization.

19651625493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33544.

The product of its digits is 1749600, while the sum is 51.

The spelling of 19651625493 in words is "nineteen billion, six hundred fifty-one million, six hundred twenty-five thousand, four hundred ninety-three".