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19949059697 = 77936074249
BaseRepresentation
bin10010100101000011…
…100111111001110001
31220111021200020021212
4102211003213321301
5311323424402242
613055305325505
71304233131620
oct224503477161
956437606255
1019949059697
1185077a68a6
123a48a96895
131b5bc80548
14d736256b7
157bb557782
hex4a50e7e71

19949059697 has 8 divisors (see below), whose sum is σ = 23087520000. Its totient is φ = 16882748064.

The previous prime is 19949059693. The next prime is 19949059721. The reversal of 19949059697 is 79695094991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19949059697 - 22 = 19949059693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19949059693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18036572 + ... + 18037677.

It is an arithmetic number, because the mean of its divisors is an integer number (2885940000).

Almost surely, 219949059697 is an apocalyptic number.

It is an amenable number.

19949059697 is a deficient number, since it is larger than the sum of its proper divisors (3138460303).

19949059697 is an equidigital number, since it uses as much as digits as its factorization.

19949059697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36074335.

The product of its (nonzero) digits is 49601160, while the sum is 68.

The spelling of 19949059697 in words is "nineteen billion, nine hundred forty-nine million, fifty-nine thousand, six hundred ninety-seven".

Divisors: 1 7 79 553 36074249 252519743 2849865671 19949059697