19651286997 has 48 divisors (see below), whose sum is σ = 30418652160. Its totient is φ = 12188395296.

The previous prime is 19651286989. The next prime is 19651287001. The reversal of 19651286997 is 79968215691.

It is not a de Polignac number, because 19651286997 - 2³ = 19651286989 is a prime.

It is a super-2 number, since 2×19651286997² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19651286297) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3973108 + ... + 3978050.

It is an arithmetic number, because the mean of its divisors is an integer number (633721920).

Almost surely, 2^19651286997 is an apocalyptic number.

It is an amenable number.

19651286997 is a deficient number, since it is larger than the sum of its proper divisors (10767365163).

19651286997 is a wasteful number, since it uses less digits than its factorization.

19651286997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5382 (or 5379 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 63.

The spelling of 19651286997 in words is "nineteen billion, six hundred fifty-one million, two hundred eighty-six thousand, nine hundred ninety-seven".